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
Thursday, January 29, 2026		 Transformerless Power Supply10
Simple Lie Detector7
Yesterday
Wednesday, January 28, 2026		 12VDC To 120VAC Inverter44
12V To 24V DC-DC Converter41
Of All Time 12VDC To 120VAC Inverter1,559,604
FM Transmitter1,030,852

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,783 61 *
Car Alarm Arming Horn Beep Canceller bob 144,521 6 *
Wireless Auto Tachometer 353,077 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,557 29 *
Parallel (Printer) Port Interface 298,840 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,017 63 *
3 Channel Spectrum Analyzer 233,079 20
40W Fluorescent Lamp Inverter Bart Milnes 339,589 60 *
Adjustable Strobe Light 320,326 36
Black Light 294,942 29
Colour (Sound) Organ 302,331 36
Electronic Dice NEW! 198,933 10 *
Fantastic Atom Expander 211,365 25
Flash Slave Trigger 231,403 18 *
Infa-Red Remote Control 650,006 216 *
IR Remote Extender NEW! 142,443 3 *
IR Remote Jammer Carl 277,233 110 *
IR Remote Switch NEW! 166,776 9 *
LASER Transmitter/Receiver 429,346 92
LED Chaser 458,910 83 *
LED Metronome NEW! 108,505 3 *
LED Thermometer 215,488 22 *
Light/Dark Detector 314,956 90 *
Simple Colour Organ 145,909 11 *
Strobe Light 284,858 27 *
TRIAC Light Dimmer 565,399 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,338 122 *
Electromagnetic Levitator NEW! 153,244 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,091 214 *
AC Motor Speed Controller 406,382 29 *
Air Flow Detector 261,155 54 *
Digital Keypad Combination Lock 210,968 20
Low Voltage Alarm 239,050 58 *
Pine Racecar Victory Judge 110,732 1 *
Pulse Width Modulation DC Motor Control 667,708 94
Rain Detector 314,867 112 *
Simple Lie Detector 577,110 323
Simple Polarity Tester Dudley LeRoux 174,997 13 *
Simple Servo Controller 231,813 22 *
Simple Touch Switch NEW! 179,970 6 *
Simple Two Speed Contactor DC Motor Controller 215,198 21 *
Stepper Motor Controller 766,364 120 *
Time Delay Relay 567,272 88
Time Delay Relay II jawaharlal@excite.com 257,521 39 *
Touch Switch 300,176 51 *
Video Activated Relay 130,355 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,197 10 *
Water Detector With Sump/Bilge Pump Controller 162,279 18 *
Wire Loop Alarm Alex Meaden 214,573 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,565 25 *
12VDC To 120VAC Inverter 1,559,604 691
6V to 12V Converter 541,293 121
Automatic 12V Lead Acid Battery Charger 951,560 248
Automatic Load Sensing Power Switch 177,237 16 *
Car Battery Charger 896,530 159 *
Dual Polarity Power Supply 383,334 84 *
Fixed Voltage Power Supply 321,814 52 *
High Current Power Supply 353,325 66 *
High Voltage High Current Power Supply 274,746 35 *
LASER Power Supply 307,380 28
Portable CD Player Adapter For Car 221,908 12 *
Power Supply 751,893 259 *
Solid State Tesla Coil NEW! 158,640 4
Solid State Tesla Coil/High Voltage Generator 459,268 51
Transformerless Power Supply 474,856 117 *
Voltage Inverter 355,256 51 *
Voltage Inverter II 213,873 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,857 182
3 Watt FM Transmitter Rae XL Tkacik 350,706 83 *
50 Watt Amplifier 521,298 74
8 Note Tune Player 149,779 12 *
8 Watt Audio Amp 387,574 67 *
Aircraft Radio Communications Receiver 292,244 50 *
Crystal Radio 171,243 53 *
Digital Volume Control 350,854 47 *
Electronic Stethoscope 333,814 142 *
FET Audio Mixer 354,852 41
FM Transmitter 1,030,852 420
Guitar Fuzz Effect 260,147 54 *
Microphone Mixer Anatoly I. Shikhatov 261,267 26 *
Mono To Stereo Synthesizer oRbEq 144,967 18 *
One Tube Regenerative Radio NEW! 161,837 4 *
Op Amp Radio 403,346 80 *
Single Chip AM Radio NEW! 109,607 4 *
Single Chip FM Radio NEW! 184,898 1 *
Sound Level Meter 353,240 51 *
Stereo Tube Amplifier Weslee Kinsler 280,019 15 *
Tone Control 321,654 31
Transistor Organ 211,019 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,057 27 *
FM Telephone Bug 243,485 57
Phone Busy Indicator 222,868 24 *
Remote Telephone Ringer 126,504 3 *
Ringing Phone Light Flasher 230,097 35 *
Simple Phone Tap Derek Tombrello 392,963 98 *
Telephone Hold Button 137,569 10
Telephone Recorder 225,439 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.