Newsletter – Homemade Circuit Projects

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hello sir. I made the circuit – infrared (ir) motor remote control circuit, specifically as per the diagram, but it didn’t work, none of the 2 relays came on ( contact connected). what could be the problem? I saw Server Isaac explain the same problem 14/4/2026. 11:49am. please advise me, email – danielnganga1968@gmail.com

Hello Daniel,
that circuit is a tested design and should work without any issues, if you build it correctly, and test it stagewise…
Please post your comment under the following article, and I will explain you how to troubleshoot your circuit step wise:
https://www.homemade-circuits.com/how-to-make-infra-red-ir-remote/

Hi sir, first i wanna thank you for your efforts,the motor doesnt turn when i click simulate on proteus,i don’t know why

Hi Isaac, which circuit are you referring to, please show the link or comment under that same post…

dear sir please help me I have a treadmill in my home which is out of order
if you have any powerfull dc drive circuit which can run my treadmill motor which is 2 HP
DC 180 volt 9.5 Amp

Hi Yasin, sure, I can help you with this. You can try the following circuit and check how it responds:
https://www.homemade-circuits.com/wp-content/uploads/2025/06/adjustable-treadmill-motor-controller-circuit.jpg
Please make sure C1 is connected directly across the pin8 and pin1 of the IC 555. Also please add a 10 ohm resistor in series between pin3 and the MOSFET gate…..

Hello sir Swagatam,
first and second schematics D2 12v zener shown is wrong.

Hi Nur, please give me the circuit link so that I can check it…

want hub motor controller circuit diagram for 24 volt dc 350 watt .
without hall sensor.
please help.

Sure, I think you can try the following circuits:
https://www.homemade-circuits.com/high-current-sensorless-bldc-motor/

https://www.homemade-circuits.com/wp-content/uploads/2024/12/HDD-motor-driver.jpg

Great information sir.
I’ve read your guide on how. Just I cant find the mention component on board I’m working on. Please assist on how to upload image of board I have here.
Cheers.

Thanks Bates, which circuit are you referring to? Yu can send the images to my email ID, as mentioned in my contact page…

Engr. good day Sir, please I need your help with the circuit diagram of a 280v DC motor speed
controller…
thanks,

Hi Sunshine, you can try the following concept:
https://www.homemade-circuits.com/wp-content/uploads/2024/03/120V-motor-speed-controller-circuit.jpg
Make sure to change the MOSFET with IRF840, and the 10k 10W will heat up significantly, if you don’t want that then you can employ a small buck converter instead.

Hello
I have a circuit diagram to test on a circuit simulator and I can’t find the LM78xx regulator component. How do I proceed or how do I look for it? I AM A BEGINNER ON THE SIMULATOR.

You can replace the 78XX output voltage with a direct voltage separately for that DC line. For example if the IC 7805, then you can replace it with a +5V input DC

Thanks for the advice, but I’m not sure if it will work on this circuit. I found the schematic online, built it, and it’s currently working. However, the original design lacks protection for the relay contacts, the relay coil, and the LM7812 regulator. I’ve added these features myself and want to test them in a simulator to check for any errors.
I’m not sure how to send you a picture of the schematic for feedback. For the power supply, I’m using a transformer (approx. 60-65A) with six 12-17V outputs, a heavy-duty rotary switch from an old welding machine, a 150A bridge rectifier, and a digital volt-ammeter with a 100A shunt. If everything works correctly, I will post it publicly on your website along with more details.

If the simulator does not support these ICs then it can be impossible to simulate the results, instead you can use a BJT equivalent current controlled regulator, such as the following:
https://www.homemade-circuits.com/wp-content/uploads/2022/04/simplest-bench-power-supply.jpg
You can feel free to send the images through the following email:
homemadecircuits
@gmail.com

why is that when i coonect strong machines the power cuts and chip blinks 2 times and off

I could be because of high current or severe voltage drop…

tienes algún plano o diagrama de bajo para aumentar el bajo ó que los parlantes den bajo solo

Sure, you can investigate it here:
https://www.homemade-circuits.com/?s=bass+boost

hi sir, sir in 220c fan regulater with push button, can we use 105j. 155j, 255j 400v insted of 0.33uf 400v? and this 7555 ic is same ne555 commen ic or its changed. plz guide me

Hi Ghulam, 105 can be used if an NTC is included in series with it along with a 22 ohm 2 watt resistor.
7555 is the CMOS version of 555 which will generate the PWMs with higher accuracy…
Both 555s are interchangeable…

sir i tried to find out 7555 cmos ic, but its not available in local markeet. from ali express its costly in my area for online dilvery, can we use ne555 ic?

Hi Ghulam, you can use any other 555 Ic version also…

sir at the place of 0.33uf capister, i am using 105j with ntc, 1 m resister need to use with capister for discharge or no need?

Ghulam, which circuit are you referring to, please comment under the same article, so that I can see that schematic and answer…

سلام .مهندس من سعید هستم من میخوام یک دستگاه پلاسما برداشتن خال و برش پلاسما درست کنم میشه کمکم کنید دستگاه رادیو فرکانسی خال

Hello Saeed, it is not recommended to make a plasms mole removal machine at home, because that can be dangerous…

Hello, thank you for answering my question. I used to have a plasma spot removal machine. I had a vacuum lamp, but it burned out. I can’t get it, and the machine is unusable. I need to build a machine with new technology.

I’m want to use 5 pics of 1n4007 diode instead of 1 pics to increase the amp by 5 times is it ok

You can connect them in parallel and wrap them up tightly with each other along with some heatsink paste, then they may work as intended…

cara membuat hemat listrik bagaimana

i actually mailed you a pwm circuit i updated. can you kindly check that and reply if that can work?

Thanks Bivash, I have replied to your email…

saludos Swagatam tengo una burman 650 voy hacer el último circuito publicado pruebo y te estoy diciendo que tal me fue saludos

Thank you Giuseppe,
Which circuit are you referring to…
Anyways all the best to you, and have a great weekend…

Sir please am in need of a 200w simple 12v to 240v transformerless inverter please urgently sir

Samson, you can try the following design:
https://www.homemade-circuits.com/ic-ir2111-h-bridge-inverter-circuit-with-shut-down/

Hello, I have made a BFO metal detector circuit using two 555 ICs. One in the transmitter and one in the receiver. In the transmitter section, there is a D2058 MOSFET. It should be connected to the third IC pin with a resistor, one pin to the negative, and one pin to one end of the transmitter coil. I don’t know which pin to connect. Also, in the receiver section, there is a C3199 transistor, one pin to the second IC pin, one pin to the negative, and one pin to the negative. But I don’t know how, which pin goes where, and also the values of the capacitors and resistors. Pins eight, seven, and six. Please advise. If there is a diagram, please send me the schematic circuit of a pulse metal detector that uses two 555 ICs. Show me the colors and values of the resistors, capacitors, and all the details. Thank you.

You can try something like tis:
https://www.homemade-circuits.com/wp-content/uploads/2025/11/555-metal-detector.jpg

Hello, I am very grateful to you, dear teacher. Thank you for answering my question. Teacher, please specify where and how the receiver coil is placed.

Mohamad, you can do as per this article:
https://320volt.com/en/simple-sensitive-metal-detector-circuit/