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I want to make a motion activated rat trap using 12v power supply, a 12v pir and a linear pull solenoid. It needs to be basic as I know very little electronics. Can you draw a circuit please.
You must know the basics of electronics and how to solder, if not then you must first learn it and then I will provide you with the circuit diagram…
Hello teacher. I need your help. I need a basic electrical circuit diagram of a step-down convector DC-DC Step Down SKU 7915. Can you help?
Hi Valera, sorry I could not find any online information regarding the IC SKU 7915….
Alternator generator with a DC motor set up. While I am im the beginning brain storming phase, How would you stop it safely without causing injury to yourself of the device. In case I want a portable one for camping or leaving my house for several days.
Hi, sorry, I could not understand what type of safety measure are you referring to? Can you please elaborate.
Hello Teacher. I received your circuit diagram for L4975A. It indicates an input voltage of 35 volts. Should I first use a voltage divider to bring the 50 volts to 35 volts and then feed it to the microcircuit? Or can I immediately feed 50 volts to pin 9
Best regards, Valera
Valera, The L4975A IC’s maximum input voltage is 55V, so 50V can be used in the following circuit:
https://www.homemade-circuits.com/wp-content/uploads/2024/09/L4975-adjustable-0-to-25V-5-amps-power-supply-circuit.jpg
I received your letter and the diagram. Where is the voltage divider or variable resistance instead of the divider? And one more question – how to determine the internal resistance of a diode floodlight
The 10k preset in the previous diagram is the feedback resistive divider.
Sorry, I am not sure how to determine the internal resistance of a diode floodlight.
Hello Teacher. I purchased L4975A and as you promised I will try to provide a circuit diagram for 4975 with feedback, to obtain a stabilized voltage of 17 volts with a load of 3 amperes. The load is a spotlight and it is desirable to take into account the power dissipation of the microassembly
Hello Valera, you can try the following circuit:
https://www.homemade-circuits.com/wp-content/uploads/2024/09/L4975-adjustable-0-to-25V-5-amps-power-supply-circuit.jpg
sir
I am from Thane ghodbunder road,
wish to visit you.
please if possible spare few minutes for me!!
Hello Bhupendra, Do you have any circuit related question? In that case you can feel free to communicate with me through this commenting platform, I will try my best to solve it for you. Please let me know!
As a model railroader, I have a crossing gate that needs to stay activated through a six-foot zone, and stays activated as long as a train remains in the zone. Could I use a six-foot piece of metal track or maybe a copper wire as a sensor plate with one of the circuits described in this article? Cars are mostly plastic.
Thanks for your question, could you please specify which circuit diagram you are referring to? I will try to figure it out for you…
hello sir,
fi am working on lvdt project.i am using peltron lvdt for measurement .As per the datasheet power supply is 3.6 vrms at 3KHZ and the output is +- 1.2v rms . my requirement is precious 3.6vrms at 3khz generator circuit and for the output i require precious rms to dc convertor circuit. Pls. suggest circuit for this project. thank you.
Hello Sridhar,
You can try any of the transistorized version from the following article, and adjust the relevant RC components for getting the desired effects.
Since your input is 3.6V, only transistorized circuits may be suitable.
https://www.homemade-circuits.com/simple-sine-wave-generator-circuits/
I constructed inverter circuit using irf9540 & irf540, it works perfectly with 12volts transformer. I need to use 24volts or 48volts transformer with the same circuit. What should I do. Thanks indeed.
If you are using P-channel MOSFETs in your H-bridge design, then I am afraid you cannot use a load voltage higher than the Vcc supply voltage of your oscillator IC, unless perhaps you use a boost converter at the oscillator outputs.
Hi Swagatam, I saw your article about a wireless charger (Wireless Charger) and I thought it was great and perfect for my university project. I was wondering about the gauge of the 2 core speaker wire used for the Transmitter and also the gauge for the Receiver.
Thank you Robert,
Sure, you can use it for your university project.
For the transmitter you can use any standard two-core flexible wire as shown in the following image:
https://www.homemade-circuits.com/wp-content/uploads/2015/09/wireless-battery.jpg
For the receiver the wire can be a 0.5mm super enameled copper wire.
Please let me know if you have any further questions.
Thanks for the immediate response! Ideally, how many turns should the Receiver coil be? And what should its ideal diameter be?
Actually the receiver coil can be exactly identical to the transmitter coil, however you can experiment with it to get the most optimal results. It might require some experimentation until the right number of turns and diameter is achieved.
It must be noted that the current output from the receiver coil can be significantly lower than the input current to the transmitter coil, and will be directly proportional to the distance between the Tx and Rx coils.
If the current from the receiver coil is not sufficient, the mobile phone might not charge properly.
Make sure the current to the transmitter coil is at least 3 amp, @12V
Hi, your circuit works like a charm! Right now the only problem that I have is that the out is fluctuating. What can I do to stabilize the Voltage and current output of the receiver coil?
That’s great, glad it is working.
To stabilize the output, please connect a 2200uF/25V capacitor right across the output terminals of the 7805 IC.
Would it be possible for you to send a 10 second video clip of the result to my above emails?… if not, no worries.
Sure! I’ll send the video through your email.
Ok, thanks so much…
Can you recommend an inexpensive place to have circuit boards made? Not for a production run, just one at a time. Thank you!
For the single PCBs the cost can be immensely high, no matter which supplier you choose.
Instead of a PCB I would suggest you to build the prototype over a strip-board.
It has been a while since I etched a circuit board, but I think I still can. It will be much cheaper than having one made. Thank You!
You are right, etching a PCB yourself can be much cheaper and interesting also.
Hello Swagatam, I recently bought a stabilizer Model: URZ3412 – 1000 VA
Input: Voltage range 145-260 VAC
I live in the UK and I need 230-235v. The problem is the stabilizer is set to 260V. It has internal settings but I don’t have its diagram. How can you help me. Thank you. N.C.
Hi Niki,
Unfortunately without a schematic it can be impossible to know which preset setting must be tweaked to adjust the high voltage trip level. Randomly testing the presets can be dangerous, so a schematic is necessary.
Hi Swagatam,
Looking for a circuit that opens a door (motor positive direction), then, upon reaching a limit switch, reverses (motor negative direction) to close again (limit switch ends the cycle). Just using a one-button, start process. Liken this to a garage door that closes immediately after opening WITHOUT the need to press CLOSE/OPEN again.
Hi David, i have an easy circuit design in mind, i will try to post it as a new article, and let you know soon…
I have designed the required circuit, you can find it in the following link:
https://www.homemade-circuits.com/automatic-door-controller-circuit-using-a-single-push-button/
Excellent work! Will begin construction. And extra thanks for the prompt response.
Sure, no problem! All the best to you.
Let me know how it goes.