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Chetan Vernekar says
Hello sir
I am chetan from karnataka
Sir is there any circutes regarding monkey repeller
kindly help me about this.
Amandeep Singh says
Hello sir,
I want to make 3RCA TO 6RCA Female cable and 3RCA TO 3RCA+RJ45 Female cable. Will you please provide me circuit for it. Pls do the needful
Thanks
Amandeep
Nishant Sheth says
Hello Swagatam,
I would like to meet you and discuss projects for welding machine. I am Mumbai based. My phone – 9820212263.
Any time will be convenient to me. Please reply.
Much awaiting,
Nishant
Ajitkumar vk says
hi sir
thanks for this valuable blog
please post a Brushed DC motor speed control circuit up to 10hp
Ajitkumar vk says
HI Sir
Thanks for this valuable blog.
can you post a brushed DC motor speed controller circuit up to 10 HP
J-max Videos says
Hi sir i need a ckt for a present. Would you plz make a ckt for me
saeed salimian says
Hello Sir
Do you have schematic of electric bike especially brushless motor and controller , how can i make a ebike for my self
thanks
Unknown says
I want to make a led lighting circuit which will show the blood flow of human heart including open close indication of valve. Can you help me to do this project providing circuit diagram and details . I want to use 230 v ac supply for input. Kindly reply me in my email id uniqash@gmail.com.
sakthi stabilizer says
HI SIR,
I NEED 3PHASE VFD CKT
bahari benoit says
i like to build led sign but i have small knowlege with the pic16F And attiny 2313 That i try to study them. I asked my friend to help me because he has many knowlege in electronique than me.
My dream is to drive many leds on one pin µcontroller. But i can't make it now.
Perhaps swagatam will help me to solve this problem,thanks a lot for your good site.
Ravindra Singh says
Hi Swagatam,
This is RSBirman.
Do you have any circuit which indicates open earth and has a NO/NC relay contacts which can trip the contactor if the earth is not connected and this will avoid the instrument from getting on.
The sensitivity should be adjustable.
Lahiru Jayawardane says
Hi,
I recently by mistake bought LED bulb(Great Value) from South America which is 110V. But I want 220V LED Bulb as I'm in Sri Lanka. Now I'm trying to do some modification on LED driver. Please help me to do this & Fix this bulb to use from 220V. Which parts need to change on the driver ?
Saeed Abu says
220v Ac COB 5w(5A) Led is getting excessive heat after connection. Also not lasting. How can I solve this problem???
Henrik Lauridsen says
Hi Swagatam,
I need a countdown timer with a relay which can be set to 1 to 5 minutes.
I would like the timer to show the preset time on 7 segments e.g. 3 min. = 180 or 3.00
When the time counts the 7 segments shall show the remaining time.
When the time is up the relay must switch off.
I don’t have Arduino and no skills in PIC programming yet.
Can you help me out with a circuit / schematic?
Thank you in advance,
Henrik
Sinivas Putta says
Dear Mr. Swagatam Majumdar,
My name is Srinivas Chakravarthi & I am working on Electro-Chemical project, for my lab work, I need an Universal Power Supply (AC/DC) with variable Voltage, variable Current & Time controlled Polarity Switching.
My requirements are:
Variable Voltage 0-100 (V),
Variable Current 0-100 (A),
AC or
DC with or without polarity Switching (1 to 10 minutes variable).
If you can make one such universal power supply unit, I shall be very much grateful to you.
Thanks & Regards,
P.Srinivas Chakravarthi.
09440840989.
Vijayawada,
Andhrapradesh.
kamal Colors says
Dear Mr.Majumdar, I am Kamal Kumar from Chennai.
I hope to find a good circuit for a battery eliminator with output dc power ranging from 1.5 to 12 or 15V and with its PCB design etc. can you kindly give me the same I will be very thankfull. I have searched every where on the internet but nothing seems good for what I am looking for. Thanks in anticipation.
Amit Kesharwani says
Hi Swagatam I am a fan of ur work..
I need a help.
My laptop and mobile over charges each night.
I want to creat a circuit that can start supply at desired time later i.e that 2 or 3 or 4 hrs later and supply should should be ON again for desired time .
I would have to enter how much time later Supply will be on and off..
Thnx man, Your work is really great.
Please inform me if you are working on this project.
Lissandro says
Hello Swagatam. I was thinking about put a sensor on the gasoline line from my motorcycle tank, near top, between the tank and the carburetor, that would consist of a pair of (innox?) leads like some mm separated from each other. This would detect the electrical conductivity inside the line, in direct contact with the fuel and while there is gasoline wetting it, it would output 0 volts, and when not (i.e. gasoline is ended and the line is becoming empty from the top), it would output positive (12v?) so I could light a warning light on the dashboard to avoid getting engine cut on a sudden. I can quickly turn the valve from to reserve position in this case. So when sensor wet, 0V(0); sensor "dry" 12V (1). What do you think? Thanks Sir.
Botwire says
Hello,
I love your website! I was looking at your circuit "twin or split battery charger" and I don’t see a value for the resistor between pins 1 &3, 7&5 for the LM358 is it 1k? I’m going to make a printed circuit board of this design using photo etching.
My goal is to build a circuit that will charge one battery while running off another battery and when the run battery falls to a certain voltage level, switch to a charged battery. I am not looking to make an over-unity device; I am interested in experimenting with energy recovery to create long pulse motor run times. I expect the system to eventually die out but I want to see how long that process will take using air coils and back emf harvesting.
Would this circuit work if I replace the batteries with two 100F 2.7v supercaps? Since the caps charge faster than lead acid batteries, this may help the efficiency of energy recovery during the run time windows.
I love building things and your awesome ability to design such cool circuits makes people like myself enjoy hours of building these cool circuits and watching them come to life.
Syed Ghouse says
Dear sir, i am very fond of u, by u i love electronics, u r really genius, u made electronics very simple.
Sir i would like to request clap switch and timer circuit for 8 volts led bulb which remain on for a long time
Please help me to solve the circuit.
Thanking u
Yours
Money makers online says
hello sir,
i really liked the way you reply to queries and your good heart of sharing. May God bless you.
please sir, am working on a project titled "remote controlled DUAL BAND MOBILE PHONE JAMMER"
i hae tried searching for a working circuit diagram but hae been able to find one. please i will appreciate it if you could be of help. thank
johnson
Aj says
Hey mate,
Would you be knowing the circuit for a zero cross detect for a transformer ?
Aj says
Hi Mate,
I am designing a Spot welder Controller with an Arduino and there is a need for a in rush current limiter. Would it possible for you to design the "In-rush-Current-limiter" i have read that it can be done in several ways. I will be using this to drive a Microwave oven transformer modified by rewiring the secondary to 3 turns of 3AWG wire for spot welding 18650 cells.
David Montenegro says
Hi Swatagam!
I would like to know if you could make a circuit that can activate a 12V 600ma stepper motor for 10 or 20 seconds every 3 hours or so. is that posible?
Kind Regards,
David Montenegro
Dr Ankit says
Sir, plz help me in making a circuit with following details. A 12 V relay is to be connected such that a momentary push switch turns it on BUT but after release of switch the the relay should not turn off immediately, rather it should turn off after some time say roughly 1minute. Thanks
Saeed Abu says
Hi I need a Nokia Mobile battery( 3.7v) driven simple Bluetooth stereo amplifier circuit diagram.Please develop it.
rakesh singh says
Hi,
I would like to convert ATX power supply to a variable power supply, can we do it ?
Anand Rampuria says
Sir your projects are really great but I am a student of class 10 sir can you help me with a idea of creating a project for science expo.
Swagatam says
Thanks Anand, provide complete details of your requirement, I'll try to help.
FARHAN NASEEM says
i need to assemble variable frequency(a pot can be use on output of 555 for variable amplitude) square wave funtion generator with frequenciies 1 Hz to 1MHz ,flexibility to vary amplitude of output ,555 should be used in astable mode and axact 50% duty cycle can be obtained on output plz help me sir in desining the above circiut i will be highly thankful to you
Dhairya Saluja says
please sir i want talk to you over phone is it possible? my mail address is
ravishimla1965@gmail.com
Thilina kumara says
Dear swagtom sir! I have heard that we can communicate by intercom using main ac power line home to home , i need communicate with my friend , there is about 3km-4km between our houses, but our ac power line is same, can you give me circuit communicate with him? please!
Swagatam says
Amit, I'll try to do it soon.
amit kumar das says
dear sir, i will enough grateful to if you can provide me the complete circuit for e rikshaw with solar system alongwith complete electronic component value, please send it to amit46vm@yahoo.com/gmail.com
regards
amit
Disha Karnataki says
This is just a simple question :
Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences?
What is the difference in the charger circuit in both case?
Aravind B Kumar says
Hello Sir
This Is Aravind Sir
I Like To Know How To Make A Transformer And Its Calculation And I Google It But I Cant Find The Proper Calculation Method And I Find Around 7 Method Of Calculation But Its Not Proper With Manufactures Standard And Can You Please Help Me To Know It Sir
Thanks You
Dinesh Khandal says
Iwant to make my own polybag sealer can you give circut of this
swetha bindhu says
Hai Sir, this is Swetha…, Am persuing Btech final year. Want to do live project. I want Gravity Light project. Can you please send circuit diagram and report please. swetha.bindhu403@gmail.com
yus kad says
hi sir i can you please design a circuit which will output 9v dc from a 12v battery efficiently . it can be by using ic 555. this will be use to run a rc toy car using 0.8A max. if possible can it be a variable output voltage dc. i have a 2n3055 transitor ,MJ11015 TRANSISTOR.
Vinod Sharma says
hello sir ,this is vinod from mussoorie near dehradun.i am not an engineering student,but i have lot of interest to make different electronic items . sir i would like to know that is it possible to use usb drive in normal tv without hdmi and usb port, by putting some type of converter in between them.if yes please tell me the circuit diagram .
Dr Ankit says
Dear Sir, can talking circuit be made eg it speaks "Welcome" running on 12 volts.
Thanks
Kevin Dearing says
I'm trying to make a circuit that will turn on them off a pair of 12v pumps in sort of a heart beat pattern, repeatedly. U haven't come closer. Any way you could help me with this?
Unknown says
I'm trying to make a circuit that will turn on them off a pair of 12v pumps in sort of a heart beat pattern, repeatedly. U haven't come closer. Any way you could help me with this?
Shayan Firoozi says
Hi again ,
thank you for all help you providing 🙂
i think this circuit could be useful and after searching many sites i could not found a good circuit !!!
i need a circuit which get 2 input for 12 volt DC 5 AMP power supply , and give one them in output ,
if primary power supply fails , secondary power supply take the action , something like Redundant Power Supply,
to my knowledge we could do it in 2 way
1- ORing Diodes
2-Fets
would you please design a circuit like that ?
Unknown says
hello sir
I am zulfiqar
I want to make a project which control the the lights, fans (and other appliances that are used in one room)
from the another room .
I have to use two controlller and a single wire communication between them
If i press light button light should be on of other room and i press fan button fan sholud be on
I have to controll the 8 things using two controllers
Kindly help me in makin my project I will be greatfull to you
Rajan Lopez says
how to connect LEDs such that it works like a series?
Chandan Parashar says
Dear Swagatam,
Greetings of the day.
Can you send me the link of circuits which uses remote bell to energise a relay, making it wireless relay activator.
Shubham Trivedi says
hello sir this is shubham from maharashtra india,
Sir my question is how general sine wave of a oscillator (consider colpits or hartly oscillator is differ from the sine wave which we use to power all AC powered equipment's. Is this possible that we can make a inverter circuit by using hartly or colpits oscillator, if yes then how? Please give me reply sir. Thanking you
amar yadav says
It looks good that you are doing lots of hard work for all your projects
But i here wanted to you to suggest you to make your website more ineteractive &attractive for the user
becoz if your site will be interactive then people will often like to keep on visiting it's an important aspect with your
toil hard work . Thank U
Walter Marafioti says
hello Swagatam can you help me with a power supply drawing for a grow led light?
direct 220 to a chain of 3 watt led ratio 4 red 1 blue
best regards walter
shefali parmar says
Hello Sir
I am working on a project of designing 40W/15V SMPS. I have all schematics of 65W and triple output of 5V, 15V,-15V SMPS. for this SMPS feedback circuit is designed for 5V output. I want design Feedback circuit for 15V output. can you explain what changes i have to make for this and how would i chose parameters for feedback circuit. I am using NCP1203 for switching. My emailid is shefalip.06@gmail.com. Please sir send me your email id so that i could send you all schematics.