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geraldo eustaqyuo says
hello friend, I am passionate about electronics and also am one of your admirers around the world. I wonder if you have some scheme of some electronic circuit able to control equipment from a distance, via mobile phone, gps, etc, because we need a device on and off the distance that can be locked. If you already have some mounted, I am interested in buying from you if it is not too high. I appreciate the attention, any questions can explain more detailed via Skype If you possess. thank you
Unknown says
hello friend, I am passionate about electronics and also am one of your admirers around the world. I wonder if you have some scheme of some electronic circuit able to control equipment from a distance, via mobile phone, gps, etc, because we need a device on and off the distance that can be locked. If you already have some mounted, I am interested in buying from you if it is not too high. I appreciate the attention, any questions can explain more detailed via Skype If you possess. thank you
Rahib says
Hi Swagatam,
Nice blog you have, I am actually looking for a transformer less power supply something like mobile chargers but i want to operate relay using it, could you please help me with this. Do you know any place from where i can order these circuits or if i can myself make it at home.
Any help will be appreciated.
Thanks & Regards,
Saiyad Rasikh
Anand vernekar says
Dear Swagatam,
Searching for small invertor circuits i reached this website , i got a 100 watt invertor circuit diagram on this website which uses
4047ic and irfz44n mosfet and successfully got running invertor thank you very much for this.
now on the same lines using this same 4047ic circuit i was trying to develop a smps with higher frequency unlike 50hz above
this time using irf840 mosfet and ferrite core of size 35mmX28mmX12mm primary winding of 300turns and seconday 18turns
i am facing the problem of irf840 getting hot quickly and also this ferrite core transformer making vibrating sound squeaking sound of
the high frequency of about 12khz to 18khz , actually i am not electronic educated but mechanical engg but having very much interest in developing and trying self useful electronic circuits
kindly help me understand what makes mosfet to go hot quickly and transformer making vibrating squeaking sound
thanks
anand
Omkar U. Pawaskar says
Sir i am omkar pawaskar
i want to make a wind based mobile charger which can charge my mobile when i ride my bike
m trying this from long but have failed pls guide
omkar pawaskar
Astral Concepts says
hello sir,
i want to make IR based fan regulator with 5 speed fan control it should not work like dimmer as dimmer based regulator make fans to create noise on slow speed. can u plz help me
vinayak says
Hi Swagatam,
I want to design DC-DC converter using OP-AMP. Specification is 12 VDC input and 48 V DC output. Can you please give some related circuits
Yalishanda Crs says
Hi swag, do you know Grid Tie Inverter with Limiter? Can you please design me a limiter that I can connect to any ordinary Grid Tie Inverter? Thanks
Swagatam says
Hello Andre,
I'll try to design the circuit for you soon and let you know, by the way please do not post on this page as it has stopped responding to comment postings
Andre vdv1 says
Hello Swagatam,
I was wondering if you could possibly assist me. on the blogs I have seen some diagrams for simple variable power supplies. Firstly I know very little about electronics, but with a shopping list and a diagram I am sure I would be okay. I would like to build a simple variable power supply with an input of 220/240 volt ac and an output variable voltage of approx. 1.5V to approx. 15V and a variable output current of up to approx. 100A. I have started zinc electroplating as a hobby (have sweaty hands and want to protect all my tools) the chemical company gave me these as a more or less dependant on my zinc plating bath size. At the moment the little 6V 8A Ryobi battery charger works for a few minutes, overheats and cuts out till it cools down again. I would really appreciate any assistance you could give me on this.
Many thanks
Andre
Anwar Peternak says
Dear Mr. Swagatam,
Happy New Year 2015……
GOD Bless You…….
I come from Indonesia…
I am Great fan of you, I like to go through your blogs and also the comments.
So finally I got inspired and start to work on very simple requirement of mine.
Please Help me Sir,
so I Need Timer 3 Hour intervals and now I Have Schematics Two Hours….Can you help us to change its?
Uploading the circuit diagram is not possible here so I have sent it via your email address hitman2008@live.in and homemadecircuits@gmail.com
Best Regards,
Anwar
Ebrahim Al-sakkaf says
Dear Swagatam,
I want to design DC to DC converter, Like 18 V from two battery 9V in series, by using I 200 or LM7809 to get 9 Volt with 600 mA, I can get the 9V from regulator, but I can not get 600 mA, How can I get the 600 mA.
Thank you
Sanjeev Aveva says
Hello everyone.
I'm a electronic novice, and would like to purchase a simple timer circuit.
I'm located in Hyderabad.
Thanks..
Sanjeev
email: asanjeevomatic@gmail.com
Raj Mukherji says
Hi,
Hope you are fine. 🙂
The purpose of writing here is to share with you an idea of a project – to design a "heart rate monitor alarm" which can be made by using commonly available low cost components and which will produce an audible alarm whenever the pulse rate of anyone is found to be abnormal. It should meet the following conditions as well:
a. Compact and light weight, therefore portable
b. Consume minimum power, therefore should run 24×7 for a month or two from a couple of AA batteries or a 9 volt pack
c. Should be fairly accurate in it's performance
I know there are many such circuits available on the net but their performance and reliability are questionable. The unit can be very useful especially for elderly people (with / without a heart disease), for patients who are bed ridden and so on. When the heart either beats at a rate higher/lower than a set average threshold value, the alarm will sound loudly enough to alert people around the patient.
I hope that my proposal is clear to you. However, if you have any doubt, please drop me an e-mail.
Thank you,
Kind regards,
Raj Kumar Mukherji
Swagatam says
….
Unknown says
Sir, Can you provide me with a circuit to scare birds circling around our gatherings in park.
Thanks in advance.
E.R.Murthy.
I Capatosta says
In the https://www.homemade-circuits.com/2012/05/make-this-emf-pump-circuit-and-go-ghost.html how do you wire the cols
Is it a single wire or multiple wires – the coild picture seems to show 3 wired on the lower right coil and only two wire for the other 3 – Where did the third wire come from ?
Sorry for the stupid question I'm a noob
Swagatam says
This page is not responding to comments, however I have read your comment which you have posted, I'll do the required corrections in the DRL circuit.
siddu says
Hi Sir,
I have TVS heavy duty bike and I want to it convers battery I mean how to fix the battery along with please send me the circuit diagram to my mail id ssinnurs@gmail.com
siddu says
Hi Sir,
I have gone through your technical review very helpful.
Hunain khan says
Hi,
I need a circuit to start an Electric Generator automatically when power is failure, and then stop it when main power is ON. can you help me? is there any idea based on 555 timer sircuit using SPDT relay.I have a 3KV electric generator with selfstart option.
Thanks.
Prabuddha Koralagama says
Hi,
could you please publish 3 phase regulator rectifier circuit for motorcycle . thank you
SarAnG shAstRaKaR says
Hello sir,
I need a circuit which will make 12 volt relay initially On, as soon as I trigger, relay should get OFF until I restart the hole circuit. Relay should stay OFF irrespective of thereafter triggering.
Ahmed Sabra says
hi Swagatam
i have an ic voice recorder model vr330
at first it was working well
recently it always shut off "battery low" i replaced the battery but no success.. i used lm1117 3.3v but also the same result.. it always tell low battery and shut down..
i checked every single item on the board but didnt find any item harmed
is there any chance that i could fix it ?
thank you
Swagatam says
3 in series with a 6 ohm resistor
Ullah Nadeem says
Hello Sir Can you tell me how many 1 watt LED I can use in series on 12v 500mAh charger usually use for modems etc. Do I need any resistor to do such. Regards
Dan Andrei Andor says
Hi i have a request :D, if it's possible. a circuit for a DRL (day running light.) made with 10 LED white, the circuit for led must be with impulse (impulse control) a potentiometer for frequence control , frequence between (i can see the led blink -and- over eyes can percept). if you have a idee. V=12 V
Swagatam says
Bhanu, email addresses are given in the above page
bhanu prasad Mishra says
Sir how can i send you a circuit in your email id or what…. I want to send a circuit …..me bhanu
leen agustin says
Hello sir, I really need your help. Any suggestion of a circuit or electronics components I’ll be needed to build a circuit for an automated conveyor that could detect if the boxes are large, medium or small and sorted them to 3 different directions. The size of the conveyor is 10 inch by 18 inch. By the way sir I’m from Philippines and I’ am a currently second year college student taking up Electronics and communication engineering, and that project was my final requirements for industrial electronics sir. I really hope you’ll respond as soon as you saw this. Big thanks to you sir. Have a good day
jnroad says
Hello sir.
I want to make simple SMPS welding machine for my personnel use .if u have any complete circuit and design please help me.
thanks
Swagatam says
The circuit presented in the following link is correct and will surely work, although it's not yet tested by me, but I am sure about it.
2.bp.blogspot.com/-Kn2Xo60G6wc/Txl5qizRSFI/AAAAAAAAAvM/Qbv2xxlIX6c/s1600/Musical+Door+Bell+with+Timer%252C+Circuit+Diagram%252C+Image.pn
Kaushik Mondal says
I made the circuit "Simple Door Bell Timer, with Adjustable Timing Facility" but it is not working. A few days ago I saw the same circuit in your site with some modification using bel8550 and 8050 transistors with some change. I am confuse that which one is correct and tested o.k. Please clarrify.
Ajay Dusa says
Could you post a circuit on Automatic water plant system…using some relay and transistor…..
Swagatam says
This page has stopped responding to comments, please don't post your comments on this page.
A.W.FRANCIS says
Hello Swagatam –
Your site is very good. Specially for those interested in Electronics & in Building. I have a Little Problem as I am just an electronic hobbyist. I am not aware much about the Components. Can make a Article page on this site explaining in details how to use PCB's, Correct way of connecting LED, Resisters, Diode's, Color Coding of Diodes, etc.
This will help a New Hobbyist to learn a few circuits building. There are many Ready to build kits in the market and we get all the parts mentioned in your blog easily but are struck when we have to make the connections as we get confused as to which wire has to be connected to Positive point or Negative Point. If we connect it wrongly the project may fail and if the project involves main current then the damage may be Great.
Hope you get my point.
Thanks & Regards
Francis
Swagatam says
it'll require microcontrollers
Ajay Dusa says
Can you post new like Led Propeller Clock or Rotating Led Globe it is difficult but very interesting…….
Syed Arham says
i want circuit to get DC 100v 350mA from 220vac..sir plz help me… 🙁 …
Osama Butt says
Hello Sir
I want to built static voltage stablizer using IGBT, can you help me with some proteus simulation circuits and codes
Swagatam says
Dear Gill,
the last circuit shown in the following article shows an inverter with auto-load control feature, however it will work only if the entire design is built as per the diagram:
https://www.homemade-circuits.com/2013/01/300-watts-pwm-controlled-pure-sine-wave.html
Gill says
Dear Mr Swagatam, i am an electronics hobbyist and followed your work on this site for some time now. I have learned many things from it and i like to thank you for that. For my next project i like to make an inverter with parts salvaged from obsolete ups's. I have a 2kva transformer, a print board with 16 mosfets PN80NE0 full bridge driven by 2 ic's IR2110. Do you have a circuit with load dependent correction for me that i can use?
Thanks in advance
Best regards,
Gill
Swagatam says
thanks filipe
Swagatam says
Raigon, please see the circuit shown in the following link, use only the IC2 section which is an IC555 circuit, it will respond accurately as per your desired settings, you can connect a relay directly across pin3 and ground for toggling the load
https://www.homemade-circuits.com/2012/10/automatic-40-watt-led-solar-street.html
pawan singh says
helow sirr ……I hav got a project on single phase transformer……if u don't mind den can u plz say me abt its construction n components to required to build a one phase transformer……my gmail is pawan.singh2069@ gmail.com
Ashish says
dear sir
how to make dipawli decoration light cuircut
1. runing light
2. on off light
BASHA says
hello sir iam basha your projects most sinceyarli warking
your 2 to 5 kms fm transmitar project i like it sir so you made this project my adress send me sir this project money i paying sir
please made and send me sir thanq
BASHA says
HAI IAM BASHA YOUR MADE LONG RANGE FM TRANSMITAR I LIKE IT SO IWANT IT HOW THE PRICE OF THIS CIRCUIT MADE PLEES TELL ME SIR IAM ORDER THIS PROJECT MY NATIVE PLACE IN ANDRAPRADESH GUNTUR JILLA
Swagatam says
Hi Tapas,
Thanks very much!
I am afraid you will have to buy a readymade SMPS for driving them because making one at home could be extremely complex.
With a 12V/3amp smps you can use the last configuration as shown in this post:
https://www.homemade-circuits.com/2013/06/universal-high-watt-led-current-limiter.html
patel krunal says
hello sir,
i want to make one miniature electic stove so please give me some tips to make it….
waiting for your reply….