This programmable timer can be used for switching a load ON and OFF with two sets of time delays, which are programmable from 2 seconds to 24 hours independently.
The delay timings are adjustable according to the users personal specs. The ON time delay and the OFF time delay are independently settable and this facility becomes the most important feature of a programmable timer circuit.
Using Versatile IC 4060
In this page I will elucidate a very simple yet reasonably useful timer circuit diagram whose ON time and OFF time settings are independently adjustable through ordinary pots.
The idea becomes so easily configurable due to the versatile IC 4060 which require minimal number of component for getting the unit running.
Looking at the CIRCUIT DIAGRAM below we can see that two inexpensive IC 4060 have been wired up as two independent timer modes.
However though the timing settings are independent for the two sections, these are coupled with other such that their initialization become very much interconnected.
Basically both the configurations are similar and have been rigged in the standard counting modes of the IC 4060 devices.
You may also want to make this Arduino based programmable timer circuit
How the Circuit Functions
The output of the upper IC is coupled to the reset input of the lower IC via a transistor in such a way that once the upper IC's output goes high, it triggers the lower timer into operation.
The lower IC then starts counting and when its output goes high, it halts the upper ICs counting and resets it to its original state and the process is initiated back from the start.
It simply means that as long as the upper ICs timing does not lapse the lower IC remains idle, however once the upper ICs timing lapses and its output becomes high, it switches the output load as well as the lower ICs operation.
The pot associated with the upper IC can be used for determining after how long the load will be switched ON, while the pot associated with the lower IC is used for determining how long the load remains in the switched ON position or simply after what time it should be switched OFF.
Update:
The LED positions have been changed in the following updated designs, because the earlier LED positions were conflicting with the relay operations, and therefore the positions have been relocated for ensuring foolproof operations.
Circuit Diagram of a Versatile Programmable Timer
PCB Layout
Video showing the proposed 2-stage programmable timer circuit with LEDs
Using a Start Push-Button
The above design could be upgraded with a push-button to facilitate a push button start. This further ensures that the timer shuts off completely in case a power failure occurs while the circuit is operational, which in turn ensures that crucial loads like heater, or geyser are completely turned OFF during such situations.
Calculating RC Timing Components
It can be done through a formula, but the manual way is much simpler and accurate. It can be done as I have explained below:
- Connect any arbitrarily selected resistor above 100K in place of P1/R2 in the upper circuit.
- Switch ON and carefully note down after how much time pin#3 of upper IC 4060 becomes HIGH. This will be your "sample delay".
- Once this is noted, the other desired time delays could be calculated using the following simple cross multiplication:
Sample Delay / Desired Delay = Selected Resistor / Unknown Resistor
For example if you find the pin3 becoming high after 300 seconds, this becomes your sample delay value.
Now, we have the sample delay and the resistor value responsible for this delay.
Therefore if we assume the desired delay to be 1 hour or 3600 seconds, we can calculate it by substituting the values in the previous equation:
Sample Delay / Desired Delay = Selected Resistor / Unknown Resistor
300 / 3600 = 100 / x (unknown resistor)
300x = 360000
x = 1200 k or 1.2 Meg
This shows that 1.2 Meg in place of the P1/R2 will produce the required delay of 1 hour at pin3 of a IC 4060
Please note that the above calculation is only an example and the values do not indicate the actual results.
Customizing the Above Concept
This circuit of a flexible programmable timer circuit I have explained in this article was designed by me in response to a request by Mr.Amit. Let's know more about the request and the circuit details.
Technical Specifications
I need a circuit for my aquarium where it should do the following:
It should switch off the lights at 10:00 pm and start at 7:00 am daily + switch off the light at 12:00 pm daily and switch up at 6:00 pm back.
This will help to make my fishes live longer. 🙂
Thanks in advance.
Amit desai
The Design
So here's the circuit that I came up with. As the name suggest, the timer is pretty flexible and may be adjusted to produce any desired time periods, according to the above requested format.
The circuit consists of four identical stages, made up of the IC 4060 timer configuration. Te timer sequence begins from the IC at the top left corner.
When power is switched ON this IC starts counting. Depending upon the setting of its pot, the IC triggers after a certain period og time interval.
This switches ON the relay and the driver transistor BC547 which consequently switches OFF the connected lamp. The stage gets latched with the help of the diode connected across its pin 3 and pin 11.
The above triggering also switches another BC547 transistor which connects the reset pin of the next IC 4060 to ground which initiates this stage also.
After a predetermined time, this IC also triggers its output at pin3 and gets latched by the corresponding diode, however this actionsends a feedback signal to the relay driver transistor, instantly switching it off and restoring power back to the lamp so that it lights up again.
Just as the above actions, the sequence further proceeds and switches ON the third IC 4060 in the line which counts the set time interval and pulls the relay back to OFF position via the diode connected to the collector of its bc547 transistor, such that the lamp again gets switched OFF.
As soon as the above triggering happens the last section at the bottom right corner switches into action and counts as per the setting of the respective pot, until the ICs output becomes high, this high reset the the first IC and switches ON the lamp once again so that the process may be restart the cycle all over again.
The pots may be increased to 3m3 for generating higher time interval periods, so is true with the respective capacitors.
Circuit Diagram
How to Adjust and Set Up
The timer may be adjusted as per the sent request, in the following manner:
If we consider the first timing sequence to begin at 7am and end at 12pm, means the upper left timer's P1 needs to be adjusted such that it activates the relay and switches off the relay after exactly 5 hours.
For keeping the lamp switched OFF in the above position and switch it ON back at 6 pm we now adjust P1 of the upper right timer section such that its output triggers after another 5 hours. This switches ON the lamp again.
The above situation needs to be kept intact until night 10pm, which is about 4 hours of period, therefore we adjust the lower right timer's P1 to get it triggered after 4 hours of time interval.
Finally, for initiating the above procedure back again the next morning at 7am, P1 of the last timer at the lower right is adjusted such that it resets the first timer after 9 hours..... and the cycle repeats.
For making the circuit work according to the above specified timing pattern, after adjusting the respective hours, the unit should be powered or switched ON exactly at 7 clock in the morning....rest will automatically follow.
Cascaded Programmable Timer Circuit with Multiple Outputs
If you are looking for a programmable timer circuit having multiple outputs for controlling multiple loads and with individual time settings, then the following circuit will do the job for you.
Here, a 4-step programmable timer circuit is shown, but you can add more number of 4060 stages to increase the number of cascaded outputs, as desired.
The time delay output of each 4060 timer stage can be individually adjusted and set using the relevant P1 preset.
hi sir, I want to 5v power supply and 1 day 2 times timer ( 6:00 am switch on to 6:15 am switch off ), (4:00 pm switch on to 4:15 pm switch off ).Please support circuit diagram with ic4060 for me.Thank you.
Hi Min,
It will require a combination of 4060 IC and 2 or 3 ICs of 4017….but still the timing durations might not be accurate.
Thank you for publishing your design. I am an electronics tech myself, and after a number of hours repairing things on my bench, I tend to leave and forget to turn off my desoldering station or power supplies.
So what I want to do, is use a circuit that has a start button , that closes a relay for an adjustable length of time, say 2-4 hours. Then opens and saves my Hakko desoldering station or my power supply’s from being on all night… or days.
A reset button would also be helpful, as some times I am down in the shop for longer than 2 hours.
Your thoughts?
Sure, that makes sense.
Here’s a simple design which will fulfill your requirement perfectly:
https://www.homemade-circuits.com/wp-content/uploads/2020/04/relay-based-4060-timer.jpg
You can increase the timing range by increasing the value of C1 appropriately to higher values, but it should be a non-polar capacitor only.
Please ignore the previous design and use the following instead:
https://www.homemade-circuits.com/wp-content/uploads/2024/10/simple-timer-delay-relay-circuit.jpg
The capacitor c1 can be a 1uF/50V or higher, non-polar type.
Hi dear swgatam
Me need minimum 500 milisecond.
R1,R2 and C1 what tobe
Thanks
Hi Ismail, for a single timing output you can use a 555 timer instead.
Dont single,ı want 1 munite off 0.5 sn on for filter cleaning valve.
In the article I have provided the method to calculate the part values, please follow that procedure, you should be able to identify and select the right parts as per your specification.
Thanks dear you Are perfect
Thank you, it’s my pleasure!
Sir, Thanks for yu patience in replying. I have got a request. I am using bore well motor having starting capacitor and running capacitor and i want to automatically switch it on. As you know that once power is given starting capacitor will be in closed circuit for 3 to 5 seconds and should disconnect after that. Is there any simple circuit which can replace the function of push button presently used?
Thank you Ravidran,
To keep the capacitor of the motor energized for a few seconds you can try implementing the following circuit:
https://www.homemade-circuits.com/wp-content/uploads/2024/02/motor-capacitor-delay-timer-circuit.jpg
The relay N/O contacts must be wired in series with the capacitor connection.
The 100uF capacitor and the 22k resistor values can be experimented to change the delay period as required.
The transistor can be a BC547 transistor.
This is the first time i am getting a guidance on a u tube chennal. Thanks for your quick response. I have started assembling cycles timer using CD 4060 published by you. I will make it success with your support. I do have some project. Pl share your email id.
Thank you Ravindran, i will try to help you as much as possible until you succeed.
We can comfortably discuss through this commenting platform so that other readers are also ale to go through our discussion and learn more about the subject.
Its better for me if you mention transister pin nane, like emiter collecter and base, i want to leqrn, i already maked for delay off for qs long i want, but problem is its not automatically on after 3 or 4 hrs, ppease support me……
You can checkout the BC547 datasheet below and compare the pinout details:
https://www.homemade-circuits.com/quick-datasheet-of-bc547-transistor-45v-100ma-npn-transistor/
Its more easy if you make vedio on breadboqrf for me please.its request sir plz
Please don’t try on breadboard because breadboard can have loose connection problems, build it on a perfboard by soldering.
Hello sir, hope all is going well. Sir i need your kind support. O want to diacuss about timer on and off circut. Sir can you give me a favor plz. Can you guide me resiaters, caposter valies as per cd4060 ic pin configration timing? Lile pon no 3 is for 8 to 24 hrs. Which resiaters and caposter value and pot value we have to use for same timer plz
Thanks in advance
Hello Ghulam,
There’s no accurate formula to calculate these values. You will have to find it yourself with some trial and error and using the cross multiplication formula given in the article. Please follow the steps provided under the title “Calculating RC Timing Components”
Sir thanks for reply. Sir can i put 5mm led with 100ohm resister for pulse on pin no 7 for both ics seperatly? Or of there is any other way plz guide me
Ghulam, pin#7 will produce very fast pulse, which cannot be distinguished on the LED, instead you can use pin#15 or pin#14. Use 1k series resistor.
Hello sir, sorry to disturb you again. Sir, I am facing an issue in timer circuit. It works fine for almost 2 or 3 days, but after 1 or 2 or 3 days randomly it gets stuck on delay off section. I chose pin no 1 of CD4060 for delay and pin 3 for on time. 2 capacitors 22 uF as a polar capacitor I used on pin 9, 100k on pin 10 with 500k pot, and pin 11 used 2.2 mega ohm 2 resistors in series. While working, it worked fine but got stuck some time on delay section. Please guide me why it happens?
Hello Ghulam, do not use polarized capacitors. Please use only non-polarized capacitors. You can use 22nos of 1uF/100V PPC capacitors in parallel to get an equivalent 22uF non-polar capacitor.
Dear sir, i want yo make timer for 20hrs load on and 4 hrs off. This cycle work automatically daily. Plz support me with simple diagram plz
Hello Ghulam,
The diagram is already given in the above article. You can try the first diagram.
However please do not attempt this circuit if you are a newcomer to electronics.
This circuit is recommended only for those who are reasonably expert with electronic circuits
Thanks for reply, sir i tried and its work for same time on and off, like only almost 10 seconds its on and off, i changed the resister values and pot to 1 m woth pin 10, but same. If i will not try then how i will learn, plz guide me b3cause i want to learn…..as i told you i alreqdy maked for delqy off as i want. With accurate time, but after load off not comes on automatically, i need solution for that load will on after our setting time. Plz
Hello Ghulam, The first circuit in the above article is a tested design and it worked for me perfectly.
If you are confident that you can build it then you can try the circuit step-wise. First build the upper 4060 IC stage with the BC547 and the relay as shown in the following example design. If you succeed with this, then you can add the lower 4060 stage to it and check how it works:
https://www.homemade-circuits.com/wp-content/uploads/2020/04/relay-based-4060-timer.jpg
Yes sir i tried and this uper circut is working, now how to add 2nd ic, can you make seperate diagram plz,
Ghulam, The diagram is already given in the above article. Please see the first diagram and see how the lower IC is configured with the upper IC.
Hi sir, lot of thanks for your support. now its working, thank a lot
That’s great Ghulam, glad it is working now.
Thanks for your passion to guide me…….if some one have good teacher like you then nothing is impposible. I cleared impossible mistion due to you. Thanks a lot
You are most welcome Ghulam, Please keep up the good work!
Can I use your above circuit to switch on at 6.30pm and switch off at 10.00 p.m. please?
Yes, that’s possible but the timing will not be accurate always.
Hi Swagatham
Can you please send me the circuit of the 4060 IC timer circuit for a 1 to 2 hours or more for time delay relay OFF
Hi Val,
Here’s the link you are looking for.
https://www.homemade-circuits.com/how-to-make-simple-versatile-timer/
Great article, Swagatam. I’m not too au fait with modern electronics, so please bear with me.
I’m basically wanting to switch an ultrasonic mister, powered via a mains transformer giving 24v rated at 1.0amps, on and off every 5 minutes or so (still experimenting) to control humidity in a small enclosed space I’ve constructed for a plant.
It appears to me that this circuit would do the job, but I’m unsure of several things which I hope you’ll be able to answer for me
ie what type of relay to use, what range of resistor values would you suggest I use as I’m starting from scratch, and whether It’d be feasible to tap into the 24v supply for the mister to power the circuit, using some form of voltage reduction (simple series resistor perhaps?).
Could a potentiometer be used in place of experimenting with various resistors, as the timing is not millisecond precise, and what range would you suggest please?
Thank you Peter,
If your ON/OFF time are equal and there’s no need of trying the above explained complex 4060 circuits. You can simply achieve it using a IC 555 timer circuit as explained in the following article:
https://www.homemade-circuits.com/alternate-switching-relay-timer-circuit/
You will only have to experiment with the 470uF capacitor for getting the 5 minute ON/OFF delays for the relay.
Please ignore the second load connected with the relay….you can use only one load as desired by you.
All resistors are 1/4 watt 5% CFR
Thanks for your prompt reply, Swagatam, and I appreciate you directing me to the other circuit.
However, as I’m still experimenting with timings, I think I would prefer to have the versatility of choosing different times for the on and off periods, so feel.
So could you please advise accordingly?
OK no problem, here are the answers to your previous questions:
Resistors are all 1/4 watt 5% CFR
Relay can be any 12V SPDT relay with a coil resistance between 200 ohm to 400 ohm.
To extract 12V from 24V supply , you can use a 7812 voltage regulator IC.
You can use a potentiometer only for P1 and P2 and vary the time delays as per the adjustments.
Thanks again. As I have no resistors in stock, I was hoping for some guidance on what values to purchase in order to achieve my aims. Alternatively could I substitute P1/R1 and P2/R2 with 1meg linear pots (+/- 20%) to achieve my aim, or would that not be high enough (the largest value I’ve found so far is 2M2 with a +/- 30% tolerance above 1M).
As I said, I’m not too familiar with modern electronics, but would it simply be OK to take the output voltage direct from the regulator (it has a tolerance of 2 to 4%) without any extra components?
All advice greatly appreciated.
You can replace the components at pin#10 of the IC with a 1M pot and a 10K series resistor. With C1 = 1uF you can get significantly long delays at pin#3 of the IC with these values at pin#9 and pin#10 of the IC. The remaining resistor values can be as is.
If you have good filtered DC input at the input side of the regulator then you do not have to add any other components at the output of the regulator. With a 24V input and 12V output your regulator can get very hot, so a heatsink may be required for it.
That’s excellent – thanks! As far as the 24dc supply goes, all I know is that it’s a standard mains direct plug-in transformer with 24v 1a rating made in China. Not sophisticated, but could it do the job? If not, any suggestions welcomed.
No problem, you can check the output of your adapter with a meter to confirm whether it is a pure DC or not. If it is a DC then the 7812 regulator will require no additional components for its configuration. Hopefully it should be an AC to 24V DC adapter
Yes it is 12v dc, so I guess I can go ahead!
Thankyou so much for your prompt answers and patience in dealing with my relatively basic queries!.
You are welcome, I am always glad to help!
Can I use the IC4060 timer circuit shown here only to turn a small electromagnet on and off for specified and adjustable millisecond periods of time? An example table is below. Don’t need quite the high accuracy indicated here.
Time (milliseconds)
On Off
1.09 | 28.91
0.55 | 14.45
0.36 | 9.64
0.27 | 7.23
0.22 | 5.78
0.18 | 4.82
0.16 | 4.13
0.14 | 3.61
0.12 | 3.21
0.11 | 2.89
Yes that’s possible. You would need two 4060 ICs for that. However adjusting to the milliseconds could be very difficult.
Hello Swagatam,
I’m glad it all cleared up, no harm was done.
From what I’ve read, one of the biggest disadvantages of transformerless power supplies is that they don’t protect the circuit they feed from electrical interference of any kind, without adding additional electronic components, which are either expensive or hard to find, end up increasing the complexity of executing a circuit.
Since it is a circuit with ICs and for better protection, I would like to ask if it would be possible to supply your circuit (using the TRIAC version) with a 230V/9V/1.5 VA transformer, as I have found a lot of them in emergency luminaires that have all been replaced by LEDs, and whose circuits are all functional. Do I need to rectify, filter and stabilize this power supply before feeding it to your circuit?
How would the 2 electrical diagrams look like?
Thank you in advance.
Best whishes,
Thank you Joao,
If you don’t wish to have a transformerless power supply, then the configuration woud become like this:
https://www.homemade-circuits.com/wp-content/uploads/2022/11/programmable-timer-with-triac.jpg
To this circuit you can supply a 12V DC from a transformer power supply with a full bridge rectifier and a filter capacitor or from an SMPS unit. The negative of the power supply will connect with the line that is marked with the ground symbol (line connecting the pin#8 of the ICs).
The bridge rectifier can be build using 4 diodes, and the filter capacitor can be a 1000uF/25V. You can include a 7812 IC for stabilization if you have one, which will ensure better working of the circuit.
Hello Swagatam, thank you for your reply.
Please clarify, what you are saying is that it is not possible to supply this circuit with a 9V transformer; 1.5VA , (about the meaning of 1.5VA, I will put the doubt about its meaning, in the category “https://www.homemade-circuits.com/how-to-make-transformers/”)?
Because it would imply new calculations of the electronic components used, and/or in this circuit reducing the supply voltage, would make the operation unstable?
It will be possible to use it, using a ZENER of 12V/1W (or less), also calculating its series resistance, instead of IC7812, the final voltage after rectification and filtering will rise above 9V, believe it will be sufficient/efficient ?
Best wishes,
Hello Joao,
The proposed programmable timer circuit using triac can work with any voltage between 5 V DC and 15 V DC. The ideal value is 12 V DC. If you use a 9V transformer with a full bridge rectification, that would produce around 9 x 1.41 = 12.69V or 13 V peak, which may be just sufficient for the circuit to work efficiently. Slight fluctuations in the DC will not affect the working of the circuit. However, for better accuracy you can include a 7812 IC. A zener diode will not work and could burn due to over current. Using a limiting resistor for the zener might reduce the gate current for the triac and might cause triggering issues for the triac. Nevertheless, you can try using a resistor with the zener diode and see if that works OK or not. The resistor value can be arbitrarily selected as 470 ohms. If you want to calculate it perfectly then you can refer to the following article:
How to Calculate Zener Diode Resistor
Hello Swagatam, thank you for your reply.
Well then the IC 7812 will be. Do I need to apply a heatsink to it?
What will be the expected current consumption in the TRIAC version of your circuit?
If the current is more than (1.5VA/9V=0.17A or 170mA), then “Houston, we (I) have a problem”…
Best wishes,
Hello Joao,
The consumption will not be more than 20 mA, so 170 ma is more than enough for the circuit.
Heatsink will not be required for the 7812.
Hello again,
I forgot to ask which TRIAC do you think is suitable for this application (5W/240V=0.021A or 21mA), for ON/OFF rhythmic operation? There is so many part numbers…
Best wishes,
You can use BT136 triac, it is a very common 1 amp 300V triac and may be easily accessible for the local market.
Hello Swagatam, thank you for your reply.
Best wishes
You are welcome Joao!
Hello Swagatam,
In the circuit “https://www.homemade-circuits.com/wp-content/uploads/2022/11/programmable-timer-with-triac.jpg” that you suggested, what would happen when connecting the 230 Vac mains supply , if I connected de L to the DC ground’s circuit and N (neutral) at the other end of the load?
I don’t know if it is implicit or not, in the article “Simple Triac Triggering Circuits Explained”, but I can’t find the answer to this question.
In Portugal and other European countries, it is not necessary to connect the L and N electrical conductors of the mains supply on the same side in the sockets, as the plug can be inverted.
Best wishes,
Hello João,
The Live/Neutral polarity is not critical in the specified triac circuit, you can connect the L/N any way round as you wish, it won’t have any affect on the working of the circuit.
But be very careful with this circuit, since the circuit is not isolated from mains AC it can be lethal to touch in part of the circuit in open and powered ON condition.
Hello Swagatam, thank you for your reply.
a) In the aforementioned circuit, is there any of the electronic components that need to dissipate more heat and therefore be greater than 1/4W or 1/8W, and the triac will need a heat sink?
b) To test the mentioned circuit with 12V DC, which components must be changed and what are their values?
Very soon I will share photos of the circuit that you helped me to build, using the email.
Best wishes,
Hi João,
Nothing will dissipate heat in the circuit, so no changes are required, all resistors can be 1/4 CFR. The triac BT136 may require a heatsink if the load is higher than 100 watts.
The circuit is intended to work with 12V, so nothing needs to be changed.
Sure, if you succeed with the project, please do send the pictures, I will add them to the above article.
Let me know if you face any issues.
Make sure to test the circuit without a triac and load, and only with LEDs, with one LED across pin#3 of each IC and ground. The LEDs must have a 1k series resistor.
Hello Swagatam, thank you for your reply.
What I intended to say by testing the circuit at 12vdc was the following: Assuming that the triac behaves like a switch in the ON state, if instead of using 230Vac, I use the same 12Vdc used to power the circuit, can I use as a load, for example a fan or an LED?
Best wishes,
Thank you João, the triac will latch once turned ON and will not turn off until power is switched OFF, so it won’t work with a 12V DC.
But you can use 12V AC from the transformer wires directly, that will work. Just replace the 230V AC with 12V AC, and the load can be an LED with series resistor.
Hello Swagatam, thank you for your reply.
Ok, I will use your suggestion, as it is much, much, much safer.
Best wishes,
No problem João,
please let me know how it goes.
Hello Swagatam,
The 1st place I tried to find the IC 4060 data sheet was here in this knowledge sharing space, but without success (sorry if I didn’t see it).
The 2nd was on the net, but I found so many different designations, that I was confused. I found several letters before and after the reference 4060, which left me in doubt if it is the same IC. Can you explain to me how I should analyze these same datasheets?
Best wishes,
Hello Joao,
The prefix after the 4060 is not important. Meaning, you can use any 4060 IC that you can get. The number 4060 is the only important thing that needs to be considered on the IC. All 4060 ICs should work in the same way. So you can refer to any 4060 datasheet, the specifications will be all the same.
Hello Sir,
I would like to ask you if is it possible to replace the relay with a Triac and make the circuit without transformer? So it can be assembled inside small electrical outlet to control a mosquito destroyer (240V AC/5W).
Thank you in advance
Hello Joao,
You can try the following modification:
https://www.homemade-circuits.com/wp-content/uploads/2022/10/programmable-timer-with-triac.jpg
Dear Swagatam,
Thank you for your fast reply. I´m going to try it, as soon as possible.
Please clarify me, the green LED is going to light up, at the same time as the TRIAC switch ON, or will it work as a standby indication, turning OFF when the TRIAC turns ON?
Do you believe it is not necessary to stepping down and rectify the AC mains, before de Zener? If so, is it sufficient 1W or do I need more?
Best wishes
You are welcome Joao,
The green LED will light up when the triac switches ON, and will remain switched OFF as long as the triac remains switched OFF.
The AC mains will be stepped down to 12v due to the presence of the 0.33uF/400V and the 12V zener diode, so no need of any additional circuit. Since the 0.33uF will be able to generate only 25 ma current, a 1 watt zener should be quite sufficient according to me.
Hello again,
So just because it’s only 25 mA, you don’t need a resistor in parallel with a 0.33uF capacitor either.
Best wishes
You can put a resistor parallel to the 0.33uF/400V capacitor to ensure that the capacitor is quickly discharged whenever the circuit is unplugged from mains AC. This maybe helpful to avoid a possible electric shock from capacitor discharge. However, this resistor has nothing to do with the working of the circuit.
Hello Swagatam, thank you for your reply.
Can you teach me how to calculate this resistance, in a simple way? I read (I don’t know where) that it can also serve as a fuse, is that true?
Thant you in advance.
P.S. Please tell me where I can ask my questions about LED power supplies.
Hello Joao,
I do not have the formula for calculating the resistor parallel to the 0.33uF capacitor. However, it is not required anyways, because any resistor between 330K and 1M should be able to discharge the capacitor in less than a second, so calculating may not be crucial.
No, it will not work like a fuse since it is not positioned to work like a fuse.
For LED power supply you can ask under the following article:
https://www.homemade-circuits.com/how-to-design-simple-led-driver-circuits/
Hello Swagatam, thank you for your reply.
Best wishes.
My pleasure Joao!
Would the circuit above need to have P1, R1, R2 and C1 changed in order to have the timers do minutes, instead of hours?
Only P1 and C1 needs to be changed in order to change the output delay. Alternatively only one of these could be changed for the same.
hi dear sir
i need a timer circuit that start a pump on via relay for 2 hours to circulate water of pool then off for 22 hours and again on the pump for 2 hours .repeat daily.
thanks a lot
Hi Abbasali,
2 hour ON and 24 hour OFf can be difficult to adjust, instead the timing can be adjusted to 144 minutes ON and 1296 minutes OFF.
como se instala una tarjeta que usa un CI MC14541BCP DE HORNO TOSTADOR TOASTMASTER MODELO 357S SI PUEDE INVIAR DIAGRAMA
Sorry, I do not have the information with me regarding How to install a card that uses an IC MC14541BCP OF TOASTMASTER TOAST OVEN MODEL 357S
Dear Sir,
Need circuit design for solenoid valve working. the case is that I have 2 switches, once I push on left switch it should on the left one solenoid valve and when I switch on right one the right one solenoid should work. once both switches are on then left solenoid valve should work. can you give me pcb circuit design for that. It will be great help for my project.
Thanks
Arun
Dear Arun, What is the specification of the switch? Is it SPST switch or push button type?
Dear Sir,
In addition I measured voltage between PIN3 and PIN8 shows 0V. Between PIN3 and GROUND of circuit shows 5V on both ICs. Relay is not activated and both LEDs are glowing for ewer.
Dear Sir,
Thank you very much. It works perfectly.
Nedzad Niksic
Thanks Nedzad, glad it is working now!
Dear Sir,
I copied your PCB layout and assembled the circuit exactly as it shows on PCB layout components drawing. All capacitors are 1 microF. For C3 I used tantalum. When power ON the relay is activated immediately and both LEDs are ON for ewer. When I change transistors PINOUT (here in Bosnia, you newer know who is manufacturer of such small transistors, so the PINOUT is problematic) the relay is not activated, but both LEDs are ON for ewer. Please HELP. I need the circuit that activate the relay twice a day for 2 minutes to water my plant.
Hello Nedzad, please do not rely on the PCB design since it was designed by an external source, and it might have problems.
Please build the circuit on a veroboard first according to the given schematic, and confirm its working, and then get the PCB designed from a professional designer.
The circuit is thoroughly tested and will work without any issues.
I have made this and it delays the switch-on of load first time you switch it on. The lower timer seems unable to reset the upper and they both freez counting and remain idle until you manually reset the upper timer. What could be the problem?
That should not happen. I have checked this timer thoroughly and it worked perfectly for me. Even in the video you can see the timers are changing over perfectly and providing the necessary delay outputs.
You can try checking the lower 4060 timer separately, and check whether it is working properly or not.
Thanks for the advice, retraced my circuit and found I had not properly configured the resetting/latching section of the two 4060. Works perfectly now and I am using it to turn on borehole pump for a set short period after waiting for longer period.
Thank you for the update, Glad it is working now!
Load shedding problem,
If you turn it on again, it is being reset, is there any solution? I want it to start from the time it stopped.
Sorry, that may not be possible with this circuit.
Hi
if i want make a timer that 8 sec on, 1 sec off, 1 sec on, 1.5 sec off, then repeat ; can i use this circuit ?
The above circuit is a 2 stage timer, it cannot be used for 3 stage timer as you have mentioned. For your requirement a 3nos IC 555 sequential timer would be required
Greets Swagatam,
The circuit you have here looks perfect for a 6 hour on/18 hour off timer I wish to apply to some LED-based artificial Christmas trees I use in front of my house. Looking at the circuit and PCB layout, there seems to be some discrepancy concerning the 1M resistor. Is it truly connected across pins 8 and 12 of the upper 4060 and across pins 3 and 8 of the lower 4060? When confirming the schematic with the PCB layout, it looks as if that 1M resistor has nothing to do with those 4 mentioned pins. Also, I will assume that the 2 monitoring LEDs, D4 and D5, on the PCB layout are still in the old locations you mentioned in your description’s update? Thank you for your reply.
Hello Kevin, please do not depend on the PCB layout as it was created by a non-professional individual. The diagrams are correct, and you can design your own PCB with a little effort.
So that 1M resistor IS supposed to be between all four of those pins? That puts a new spin on the circuit. And darn, already did some circuit drawing based on that PCB layout – oh well, need to sharpen my pencils again 8). Also noticing that the red LED has a 10k resistor on it – should that be a 1K resistor? Or does it matter, since the green LED is also reliant on a 10K resistor? Believe me when I say that I will breadboard this circuit to confirm its operation in either instance. Thank you for your reply, then and now.
The 1M is actually between pin#12 of the upper 4060 IC and the ground line. The pin#8 of both the ICs are Vss pins or the ground pins.
The modern RED LEDs are extremely bright!, using a 1k resistor may cause it to produce blinding illumination, that is why I have used a 10k for the RED.
The 10k for the green is a must because the 10k is actually for the transistor base, which is should be actually 22k, but normally I use 10k for a relay with a coil resistance of around 400 ohm. So the green LED might look a bit dim, nevertheless if you find it too dim, you can try lowering the base resistor to 4k7. I actually liked bread-boarding as they are not 100% reliable, I would rather suggest to go for a strip-board and assemble by soldering the parts for reliable operations.
Ok, I see that pin#12 is not only tied to the 1M in the schematic but also to the 1N4148 that goes to pin#3 on the lower 4060 IC and the polarized capacitor that is also connected to pin#16 of the lower 4060 IC. This is all on the left end of the 1M. The right end of the 1M is as you say, sharing a ground connection with the two pin#8.
I have some older LEDs that will probably work in this circuit just fine and not be killer bright; I was thinking of just having one end of the LED in the circuit and the other end with its dedicated resistor and continuing to source voltage. After all, the LED is only ‘monitoring’ the signal and not actually a functioning part of the circuit. What say you to this thought?
Finally, what relay would you use for this circuit? I’m looking at an uxcell JQC-22F-12VDC-S-Z DC 12V Coil, but when you mention the resistance of the coil itself, that info I do not see yet; will look for that.
Oh, 1 more item – since you say you are using the 10k for the red LED to be more visually comfortable, are you also saying that the 10K has nothing to do with the BC 547 across the collector and emitter? If that is so, that may eliminate a little headache I’m experiencing in my circuit design. Thank you as always for your time and reply.
Yes all the shown connections in the schematic diagram are accurate and correct.
You can connect the LED to any other favorable position, it will be fine as long as it fulfills the requirement.
The relay will depend on the load current, for loads below 5 amps, any ordinary 400 ohm coil resistance can be used.
The resistor across collector/emitter of the BC547 will not matter as long as it is over 1k ohm.
dear swagatar, to which pins the ic counter leds in the video will be connected
You can try connecting an LED with pin#14 or pin#15 for both the ICs, with respect to the ground line….make sure to have a 1k resistor in series with the individual LEDs
thank you so much sir..
You are welcome ismail!
Dear Sir:
I am looking for a controller which will put the load for 10 seconds and cut off 1o minutes. It should go cyclic manner.
I would like to have a PCB also for the same.
Would you please help me? My load is operating in 12V.
With regards
John T. Eapen
Hello John, since the ON/OFF periods are equal and short, you can implement it using any standard oscillator such as
a transistor astable
NAND astable,
4047 oscillator
555 astable
4060 astable
Hi Sir ,
I want circuit diagram for LEDs which will turn ON from 4am to 6am and 7pm to 10pm.automatically and daily at same time
Hi Prakash,
You can modify the first circuit presented in the following article:
https://www.homemade-circuits.com/how-to-make-long-duration-timer-circuit/
There are 10 outputs from the IC 4017, you wil have configure these outputs accordingly to get the required results.
Thanks for reply… you are doing great job.
You are welcome, please keep up the good work!
Sir please tell me what is the green and red symbols in circuit?
Asad, those are RED and Green LEDs, if you cannot understand the components then how did you buy them?
Sir i buy them on my own thinking…
OK, all the details are given in the diagram, please compare your components with them and assemble.
Sir please tell me what is c106 scr That is connected with button i cannot buy this because not found on shops & tell me that the button is necessary for switch on circuit & this button is push button or another type of button…
C106 is an SCR, the button is a push button. It is required only if you wish to have a push button, otherwise it is not required, you can use the first circuit
Very thankyou sir… I am assembling this circuit for egg incubator turner. Is it will work 24 hours?
You are welcome Asad, yes you can use it for 24 hours or continuously forever.
Hi! Sir Please Sir Please Answer to My All Questions.
#1): What are the green and red symbols in diagram like led diode?
#2): Is All Diodes that are used in circuit are 1N4007?
#3): What is the Wattage of Resistors that are used?
#4): What is mean of arrow on P1 & P2?
#5): What is C106 scr with switch?
#6):For What thing the switch is used?
#7): The upper +12 of switch is will connect to the +12v of circuit?
#8): Where We Connect Leds Like your video?
*Can You Give Me your Fb Link or something like this for Contacting*…
Hi Asad, You should try to figure them out yourself because all the answers are provided in the diagram itself and article description. It seems you are extremely new to electronics in that case you must first learn all the basics of electronics and only then attempt this circuit.
Sir please give me Answer… I want yo apply on my egg incubator please sir please… 1 Already Purchased All Components….
Asad, those are RED and Green LEDs, if you cannot understand the components then how did you buy them?
nice desings
Hi
nice website. very useful information. Unfortunately I have built another circuit with 4060 but its not working as it said. can I send the circuit for you? maybe you can help me with that. i really appreciate that.
Hi, you can upload to any free image hosting site and provide the link to me here, if possible I’ll try to solve it for you…
Hi and thank you for sharing your great circuits. Is the pcb layout for the 1st timer, inverted & sized correctly or do we still need to invert & check sizing?
Hi thanks, the PCB was designed and submitted by an external source, so the users are advised to check and verify the design by themselves and then implement it.
Thanks for your reply.
I’ll be sure to double check it then.
Thanks so much.
Hi again. I built the circuit & it is working very nicely. I’m just struggling to calculate the timing resistors. Currently I’m not able to set the time’s to low value’s like 2secs (just for testing) as stated. I end up waiting hours to get the green led to turn on, no matter how I adjust the pots. Can you please explain in a bit more detail, how to calculate the timing resistor values. “Sample Delay / Desired Delay = Selected Resistor / Unknown Resistor”. What value do I put for the “delay”? Is the value in seconds? Eg: 1hr = 3600. Also I’m uncertain about “Connect any arbitrarily selected resistor above 100K in place of P2/R2 in the upper circuit.” Are you referring to the P2 (potentiometer) connected to the lower IC4060 & R2 (fixed resistor) of the upper IC4060 and should they both be the same value? I appreciate your assistance. Thanks so much.
Hi, yes P1, P2 are the potentiometers or the presets in series with the resistor R2. You can replace this combination with a single fixed resistor
I have updated the calculations with a practical example but this example does not exhibit the real results, it is only for understanding purpose..
Sir Please Tell Me What Is 2M2 and 1M in the Circuit… & please tell me which is the latest diagram that i will use to make this… Please….
Asad, you can build the first diagram. 2M2 = 2.2 Mega ohm, 1 M = 1 Mega ohm
Hi
I require a mains monitoring circuit which switches a 230 volt ac supply off and switches an inverter on if I have a power cut and then returns the 230 volt ac supply into the circuit when the mains then returns stable for minimum 60 seconds. The inverter is powered by a 150 amp/hour leisure battery which is recharged from the 230 volt ac supply. There is a stipulation wherein the inverter output can only replace the 230 volt ac supply when it itself is stable (after 5 seconds). So, in effect, I would have an uninteruptable power supply which, in state 1, would switch through a 230 volt 16 amp ac supply but when this fails, state 2 would be initiated which is a 4000 watt inverter, which is fed from 12 volts dc and would be switched into the circuit after 5 seconds and when the 230 volt ac supply returns for at least 60 seconds, state 1 would be re-constituted. I already have the inverter and the battery and charger,
I think that I have (with some difficulty) explained my situation. If you can help me with this logical conundrum, please do.
Thanks and regards
Ivor H. Barnett
Logical Diagram:
230 volts ac present >> 230 volt ac switched through to load. >> Inverter output isolated.
230 volts ac absent >> 230 volt line isolated. Inverter powered on (single pole 1 way relay contact) >> 5 second delay >> Inverter output switched to load.
230 volts ac line returns stable for minimum 60 seconds >> 230 volts ac switched to load. >> Inverter output isolated.
230 volts ac absent—— Inverter output absent >> Load isolated from both supply lines.
Hi, it looks feasible, I’ll try to figure it out and design it soon….
Many thanks and a good new year tto you.
Regards
Ivor
Thank you, and wish you too a Happy New Year!
You can checkout the following circuit
Hi
It would seem that your Mains High Low Voltage Protection Circuit with Delay Monitor would fill mt necessity perfectly. Do you have a PCB design for it or must I make one myself?
If you can help me with this, please reply to me with the price.
Thanks and regards
Ivor Barnett
Sorry, I do not have a PCB design for it, you will have to contact professional designer for this. But you must first test the circuit on a general PCB before designing the PCB.
Hi,
I have a sprinkler coupled with solenoid valve and I want to automatically switch it ON every evening @ 5 pm to 5:30 pm (only 30 mnts a day) and rest of the time it should be in Off state. So please can you set a ckt. Diagram for the same.
Hi, you can use the first circuit from the above article. For C1 use 20uF/25V for the upper 4060 circuit, and for the lower 4060 circuit you can use a 1uF/25V capacitor. The 25uF capacitor should be configured using 20nos of 1uF/100V PPC capacitors in parallel. For calibrating try any resistor such as 47k resistor in place of P1 + R2, and check after how much time the pin#3 goes high. Use this value in the following equation to get the actual resistor for the required time :
47 / R = delay obtained for 47k / required delay
R is the resistor which must be used for the P1 + R2 or P2 + R2.
Hello Sir,
So the value of R for upper IC is kept large and lower IC is kept verry small.
Yes that’s correct.
Thank you Sir..
In my ckt. Referring to fig: 1, when the 1st IC O/P gose high, 2nd IC suddenly resets the 1St IC, so O/P remains ON for a fraction of second and turns off. O/P LED only blinks. Initially the ckt. Worked properly, but the problem occurred after 5 days.
Please check or replace the P2/C1 pats values or settings of the lower 4060 IC, and check the response again.
Hello Sir,
If zener diode connecting IC-2, 3rd terminal to IC-1, 12th terminal went wrong then such thing happens? Because yesterday there is accidental short occurd in 3rd terminal to 12th terminal.
Mostly it will have no effect, but make sure the short is removed now.
Ok sir
Hi…
I want to develop Circuit for my one of Commercial Product,
Request you to contact me as soon as possible,
Please email me back.
Thanks…
Hi, I have replied to your email.
Hello sir
I’m required to create a logic circuit project that is programable meaning it must have a code to it
I decided to create a switch timer for homes but I’m not really sure about the components to use and how to design them in my project
How can I go about it with designing my project
Hello Charmaine, please provide more details regarding the functioning of the project and the type of code you want it to work with?I’ll try to figure it out..
Hello Sir..
I want make timer delay 90minutes use CD4060 to control LED.
idea use single push on /off button to turn on/off LED, also LED can turn off automatically after 90 minutes.
1. When push button… LED turn ON, Timer start counting.
2. When push button once again … LED turn OFF, Timer stop.
3. When push button once again.. LED turn ON and Timer start counting.
4. if Timer reach 90minutes, LED turn OFF.
5. if push button once again LED turn ON and Timer start counting
Can you teach me which circuit suitable with my idea ?
I try use Timer CD4060, but I cannot stop Timer without waiting until timer reach desired time.
Hello Damanhuri,
you will have to use an SPDT switch for this, a push button will not be appropriate.
Connect pin#12 of 4060 with the center terminal of the SPDT, connect one outer terminal of the switch with the positive line, and the other with the negative line.
That’s all, your application will be fulfilled with this!
Toggling the switch up/down will accomplish the required operations!
…and make sure to connect the output pin (pin#3 recommended) with pin#11 through a 1N4148
Hello Sir..
Thank You for your advice.
i try, But I found problem. when select switch SPDT to (+) or (-) … only timer stop or start counting, but output IC no change (same as previous condition).
– SPDT to (+) –> timer stop, Output Low.
– SPDT to (-) –> timer start counting, Output still Low. (Output High if timer reach desired time).
– after Output High,
I need every select switch SPDT, Output also changing.
Hello Damanhuri, The IC 4060 will always begin counting with a zero logic, to invert this you can connect a PNP transistor with the IC output. Connect its base with the IC output through a resistor 10K. Connect its emitter with the positive line, and then the relay can be connected across the collector and ground.
Hello.
Thank You for your help.
I mean, when Output IC Low, and toggling the switch, Output keep Low.
I need Output change every time toggling the switch.
For Example :
a. ON/OFF mode during timer counting (not yet finish desired time).
– Push switch –> Output Low –> Push Switch –> Output High –> and so on.
b. ON/OFF mode with Timer reach desired time.
– Push switch –> Output Low (timer count) –> Timer finish –> automatic Output High –> Push switch –> Output Low (timer count) –> push switch –> Output High –> push switch –> and so on.
Sorry for your inconvenience cause.
I can implement the a) operation, it will be on the output side of the IC. meaning while the timer is counting the output state can be reversed as required from high to low or low to high, so that when the timer finishes counting it will again revert the selected logic by the user.
I am sure not about the b) option
Thank You for your guidance and your patience sir.
I study some option :
1. I use single push on/off button on pin#12 (as reset). and adjust Capacitor on pin#9 to change clock to faster counting. (For example use 2 parallel Cap 100pF and 10uF).
when push button –> timer counting –> push button –> i remove Cap 10uF to faster timer and then timer become finish –> output High.
But I don’t know how to use electronic switching circuit to control this Cap.
2. I add Push ON/OFF latch transistor circuit to cut off Vcc of IC 4060.
so, when push button –> Vcc ON to IC 4060 –> timer start counting –> push button –> Vcc cut off to IC 4060.
but problem, when push button –> Vcc ON –> timer start counting –> timer finished –> push button –> Vcc cut off to IC 4060 (suppose Vcc ON).
Hi Damanhuri, for electronic selection you will have to use a relay and a flip flop circuit, that will solve the 1) problem, as shown here:
https://www.homemade-circuits.com/simple-touch-sensor-switch-circuit/
for the second option you will have to operate pin#12 with a SPDT switch as described earlier, Vcc ON/OFF will not work.
Sir the switch is ok and working properly,thankyou for your guidance and patience sir,????????????,..my only problem now is how to set my desired time,.do you have a tip sir how to get your desired time needed?,.thankyou verymuvh,.????????????
That’s good Ken, I have updated the method in the article. Please check it out
Thanks,…sir it is possible to put a reset switch in lower ic?,.how can i do that sir?,.that when i push the reset switch the lower ic reset and start counting,.and the upper ic stop counting,…
Connect a 1K in series with the pin#4 of IC 555 in addition to the 1n4148
Now shorting pin#4 with ground will reset the IC
I need to add a ic 555 sir?,..but the lower ic is 4060,how can i rest it to stop the upper ic counting and the lower ic start counting..
OK, I think I got confused with the other comment sent by Mr. Davis.
If you have IC 4060 for the lower side you can do in this way:
connect pin#12 with the BC547 collector though a 10K resistor. Now shorting the 1M at pin#12 will reset the lower IC
Sir how can i put a switch that can stop the upper ic automaticaly from counting and make the lower ic start to count,.,.like bypassing the upper ic to switch the lower ic 4060,…for example i want to use the the load in my circuit,.when i press the switch the lower ic will start to count,.by passing the upper ic causing it to stop from counting..
Ken, connect a push-to-ON switch across the 1uF connected with pin#12. Pressing this switch momentarily will reset the upper IC
When i short the 1M in pin12 of the lower ic, the upper ic is still counting,.. I want a switch the stop the upper ic from counting and start the lower ic from counting,..
Can u send me a schematic sir,..the lower ic is 4060 sir,..i need a reset switch sir that can stop the upper ic counting and the lower ic start counting,.thanks
Yes sir i made the reset in upper ic…how about in the lower ic sir?,.because i connect the collector of bc547 in the pin12 of the lower ic with 10k,and i short the 1M in pin12 of lower ic to reset the lower ic like you said,..it reset the lower ic sir but it only works if the lower ic start counting sir,..i what a switch sir that even the upper ic is not yet finish counting,when u press the switch the upper ic stop from counting and the lower ic start to count,.pls help sir
Ken, This is a 2 stage programmable timer which is designed to work in sequence. They cannot run separately. Otherwise you may have to create two of these without linking them together through the lower BC547
So i can not run the lower ic that can bypass the upper ic,…ok sir thanks for assistance,,.????
It’s probably not possible, because the upper IC won’t stop counting until its pin#3 goes high.
Hi sir, I am learning a lot from you, i am burning with desire to try your circuits
Sure Gerald, I wish you all the best!!
Whats the main use of c106 scr in the circuit sir?,..when you push it on using momentary switch it stay on until the power failure occurs or you remove the supply?
it’s for latching power to the circuit with a single push of the button…the latch is restored back to OFF when power is switched OFF
Ok sir,..why when i push the button it stay on when i release, it turns off,.what should be the problem of the circuit sir?
OK, it’s probably due to the 1M resistor, please reduce it to 10K and check again
I try to change 1M to 10k sir,.but the result is the same,.when i release the button the circuit also stop,..
try it separately. Connect a LED with 1K across anode and positive line, and cathode to ground. If the led latches ON then the ScR is good otherwise there could be some problem with the SCR or its connections.
Hi SWAGATAM I made the circuit for 555 timer and tested it worked for short delay I wanted but when I connected it to the upper 4060 circuit as u told me . It has failed to trigger the load , testing both circuit separately work but don’t know why it has failed .help.thanks
Hi Davis, it has to work, try connecting pin#4 of IC 555 through a diode 1N4148. Cathode will go to pin#4, and anode to pin#3 of 4060. Also connect a 10K from pin#4 to ground. To monitor the output of IC555, connect an LED from its pin#3 to ground via a 1K resistor.
Thanks my master SWAGATAM it has worked perfectly.
I am glad it worked!!
Hi SWAGATAM, for upper circuit help me how to replace the lower 4060 ic with 555timer circuit for short time count ,the reason I have hcf4060 ic tested and was counting as I tested first stage but when replaced with cd4060 the ic failed to count I bought many from different store failed to work but for hcf4060 worked perfectly for that reason I want lower stage I use 555timer for short delay and upper stage using my hcf4060 for long delay.help me my master thanks
Hi Davis, you can probably do it in this way:
remove the lower BC547, and its base 10K
configure IC555 in its basic astable mode. Connect its pin#4 with pin#3 of IC 4060
Connect pin#3 of IC555 with pin#12 of IC 4060 through a 1N4148 diode.
This should do the job