Electronic Circuits

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Here are some neat circuits you might want to try. The schematics and printed circuit board patterns are GIF's, and may show up different on some browsers. You might want to save the images (especially the PC board patterns) to your hard drive, load them into a photo editor (Photoshop, Paint Shop Pro, The GIMP, etc.) and adjust the size before you transfer the pattern to a board. Printed circuit board patterns are available possible. This page is always under construction and there will be new additions from time to time. Some of these circuits were designed by me, most are not. Whenever possible I have tried to credit the author of a circuit but since many of these circuits are from my personal collection that I have gathered over a period of many years, this information is not always available.

You can rank circuits according to how much you like a circuit by clicking on the lightning bolt icons. These ranks can be based on how much you like a circuit, whether a circuit worked or didn't work for you, or how useful you found a circuit. Additionally you can add your own comments at the bottom of each circuit by filling out the form.

Circuit Catagories

Circuits are divided into categories as listed below.

Catagory Circuits
Auto 3
Computer 2
Light/Laser 21
Major Projects 2
Other 21
Power Supply 18
Sound/Radio 22
Telephone 8

Some circuits in this list have little astrisk (*) markers beside them which give a basic amount of information regarding whether the circuit has been designed, tested or modified by the webmaster.

Marker Description
* The circuit has not been tested by me. Therefore, I will offer no gaurantee that they will work.
* This circuit has been designed by me.
* This circuit was not designed by me, but was modified by me.

Most Popular Circuits

The most popular circuits of today, yesterday and all time can be found below.

When Circuit Views
Today
Friday, February 13, 2026		 12VDC To 120VAC Inverter47
FM Transmitter34
Yesterday
Thursday, February 12, 2026		 Simple Two Speed Contactor DC Motor Controller 35
Stepper Motor Controller32
Of All Time 12VDC To 120VAC Inverter1,560,254
FM Transmitter1,031,419

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,037 61 *
Car Alarm Arming Horn Beep Canceller bob 144,724 6 *
Wireless Auto Tachometer 353,361 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,754 29 *
Parallel (Printer) Port Interface 299,123 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,327 63 *
3 Channel Spectrum Analyzer 233,359 20
40W Fluorescent Lamp Inverter Bart Milnes 339,876 60 *
Adjustable Strobe Light 320,587 36
Black Light 295,281 29
Colour (Sound) Organ 302,621 36
Electronic Dice NEW! 199,185 10 *
Fantastic Atom Expander 211,550 25
Flash Slave Trigger 231,681 18 *
Infa-Red Remote Control 650,314 216 *
IR Remote Extender NEW! 142,718 3 *
IR Remote Jammer Carl 277,509 110 *
IR Remote Switch NEW! 167,024 9 *
LASER Transmitter/Receiver 429,678 92
LED Chaser 459,266 83 *
LED Metronome NEW! 108,748 3 *
LED Thermometer 215,715 22 *
Light/Dark Detector 315,185 90 *
Simple Colour Organ 146,113 11 *
Strobe Light 285,089 27 *
TRIAC Light Dimmer 565,765 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,643 122 *
Electromagnetic Levitator NEW! 153,495 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,502 214 *
AC Motor Speed Controller 406,692 29 *
Air Flow Detector 261,378 54 *
Digital Keypad Combination Lock 211,199 20
Low Voltage Alarm 239,294 58 *
Pine Racecar Victory Judge 110,940 1 *
Pulse Width Modulation DC Motor Control 668,057 94
Rain Detector 315,121 112 *
Simple Lie Detector 577,412 323
Simple Polarity Tester Dudley LeRoux 175,240 13 *
Simple Servo Controller 232,052 22 *
Simple Touch Switch NEW! 180,230 6 *
Simple Two Speed Contactor DC Motor Controller 215,456 21 *
Stepper Motor Controller 766,803 120 *
Time Delay Relay 567,555 88
Time Delay Relay II jawaharlal@excite.com 257,764 39 *
Touch Switch 300,425 51 *
Video Activated Relay 130,562 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,517 10 *
Water Detector With Sump/Bilge Pump Controller 162,541 18 *
Wire Loop Alarm Alex Meaden 214,777 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,090 25 *
12VDC To 120VAC Inverter 1,560,254 691
6V to 12V Converter 541,644 121
Automatic 12V Lead Acid Battery Charger 952,003 248
Automatic Load Sensing Power Switch 177,500 16 *
Car Battery Charger 896,870 159 *
Dual Polarity Power Supply 383,634 84 *
Fixed Voltage Power Supply 322,057 52 *
High Current Power Supply 353,627 66 *
High Voltage High Current Power Supply 275,017 35 *
LASER Power Supply 307,659 28
Portable CD Player Adapter For Car 222,162 12 *
Power Supply 752,228 259 *
Solid State Tesla Coil NEW! 159,019 4
Solid State Tesla Coil/High Voltage Generator 459,627 51
Transformerless Power Supply 475,137 117 *
Voltage Inverter 355,632 51 *
Voltage Inverter II 214,111 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,121 182
3 Watt FM Transmitter Rae XL Tkacik 351,053 83 *
50 Watt Amplifier 521,590 74
8 Note Tune Player 149,962 12 *
8 Watt Audio Amp 387,926 67 *
Aircraft Radio Communications Receiver 292,544 50 *
Crystal Radio 171,573 53 *
Digital Volume Control 351,157 47 *
Electronic Stethoscope 334,089 142 *
FET Audio Mixer 355,110 41
FM Transmitter 1,031,419 420
Guitar Fuzz Effect 260,467 54 *
Microphone Mixer Anatoly I. Shikhatov 261,552 26 *
Mono To Stereo Synthesizer oRbEq 145,257 18 *
One Tube Regenerative Radio NEW! 162,256 4 *
Op Amp Radio 403,700 80 *
Single Chip AM Radio NEW! 109,898 4 *
Single Chip FM Radio NEW! 185,189 1 *
Sound Level Meter 353,525 51 *
Stereo Tube Amplifier Weslee Kinsler 280,327 15 *
Tone Control 321,937 31
Transistor Organ 211,278 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,263 27 *
FM Telephone Bug 243,701 57
Phone Busy Indicator 223,108 24 *
Remote Telephone Ringer 126,749 3 *
Ringing Phone Light Flasher 230,449 35 *
Simple Phone Tap Derek Tombrello 393,269 98 *
Telephone Hold Button 137,808 10
Telephone Recorder 225,674 55 *

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All material marked as mine is property of Aaron Cake. You may, however, distribute it as much as you want, with or without credit to me. Just don't claim credit for it yourself, and it would be nice if you included a link back to my page. All other material is property of its authors.