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
Tuesday, October 28, 2025		 12V To 24V DC-DC Converter69
12VDC To 120VAC Inverter65
Yesterday
Monday, October 27, 2025		 12VDC To 120VAC Inverter76
FM Transmitter63
Of All Time 12VDC To 120VAC Inverter1,555,066
FM Transmitter1,027,370

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,336 61 *
Car Alarm Arming Horn Beep Canceller bob 143,067 6 *
Wireless Auto Tachometer 351,305 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,376 29 *
Parallel (Printer) Port Interface 296,837 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,157 63 *
3 Channel Spectrum Analyzer 231,340 20
40W Fluorescent Lamp Inverter Bart Milnes 337,939 60 *
Adjustable Strobe Light 318,648 36
Black Light 292,773 29
Colour (Sound) Organ 300,356 36
Electronic Dice NEW! 197,224 10 *
Fantastic Atom Expander 209,878 25
Flash Slave Trigger 229,701 18 *
Infa-Red Remote Control 647,995 216 *
IR Remote Extender NEW! 140,783 3 *
IR Remote Jammer Carl 275,499 110 *
IR Remote Switch NEW! 165,125 9 *
LASER Transmitter/Receiver 427,436 92
LED Chaser 456,840 83 *
LED Metronome NEW! 106,936 3 *
LED Thermometer 214,129 22 *
Light/Dark Detector 313,516 90 *
Simple Colour Organ 144,443 11 *
Strobe Light 283,390 27 *
TRIAC Light Dimmer 563,380 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,562 122 *
Electromagnetic Levitator NEW! 151,788 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,121 214 *
AC Motor Speed Controller 404,095 29 *
Air Flow Detector 259,562 54 *
Digital Keypad Combination Lock 209,402 20
Low Voltage Alarm 237,318 58 *
Pine Racecar Victory Judge 109,363 1 *
Pulse Width Modulation DC Motor Control 665,632 94
Rain Detector 313,154 112 *
Simple Lie Detector 575,105 323
Simple Polarity Tester Dudley LeRoux 173,107 13 *
Simple Servo Controller 230,102 22 *
Simple Touch Switch NEW! 178,173 6 *
Simple Two Speed Contactor DC Motor Controller 213,523 21 *
Stepper Motor Controller 763,636 120 *
Time Delay Relay 565,485 88
Time Delay Relay II jawaharlal@excite.com 255,729 39 *
Touch Switch 298,486 51 *
Video Activated Relay 128,939 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,011 10 *
Water Detector With Sump/Bilge Pump Controller 160,481 18 *
Wire Loop Alarm Alex Meaden 213,214 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 329,732 25 *
12VDC To 120VAC Inverter 1,555,066 691
6V to 12V Converter 539,145 121
Automatic 12V Lead Acid Battery Charger 949,172 248
Automatic Load Sensing Power Switch 175,637 16 *
Car Battery Charger 894,436 159 *
Dual Polarity Power Supply 381,135 84 *
Fixed Voltage Power Supply 320,222 52 *
High Current Power Supply 351,089 66 *
High Voltage High Current Power Supply 272,920 35 *
LASER Power Supply 305,722 28
Portable CD Player Adapter For Car 220,189 12 *
Power Supply 749,960 259 *
Solid State Tesla Coil NEW! 156,439 4
Solid State Tesla Coil/High Voltage Generator 456,819 51
Transformerless Power Supply 472,862 117 *
Voltage Inverter 352,896 51 *
Voltage Inverter II 212,150 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,047 182
3 Watt FM Transmitter Rae XL Tkacik 348,434 83 *
50 Watt Amplifier 519,306 74
8 Note Tune Player 148,192 12 *
8 Watt Audio Amp 385,392 67 *
Aircraft Radio Communications Receiver 290,194 50 *
Crystal Radio 168,995 53 *
Digital Volume Control 348,836 47 *
Electronic Stethoscope 331,967 142 *
FET Audio Mixer 353,218 41
FM Transmitter 1,027,370 420
Guitar Fuzz Effect 257,931 54 *
Microphone Mixer Anatoly I. Shikhatov 259,640 26 *
Mono To Stereo Synthesizer oRbEq 143,189 18 *
One Tube Regenerative Radio NEW! 159,114 4 *
Op Amp Radio 401,441 80 *
Single Chip AM Radio NEW! 107,966 4 *
Single Chip FM Radio NEW! 182,838 1 *
Sound Level Meter 351,466 51 *
Stereo Tube Amplifier Weslee Kinsler 277,803 15 *
Tone Control 319,652 31
Transistor Organ 209,258 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,677 27 *
FM Telephone Bug 242,272 57
Phone Busy Indicator 221,472 24 *
Remote Telephone Ringer 125,078 3 *
Ringing Phone Light Flasher 228,292 35 *
Simple Phone Tap Derek Tombrello 391,575 98 *
Telephone Hold Button 136,326 10
Telephone Recorder 224,157 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.