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, February 12, 2026		 Simple Two Speed Contactor DC Motor Controller 29
Stepper Motor Controller29
Yesterday
Wednesday, February 11, 2026		 12VDC To 120VAC Inverter42
Automatic 12V Lead Acid Battery Charger33
Of All Time 12VDC To 120VAC Inverter1,560,200
FM Transmitter1,031,380

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,018 61 *
Car Alarm Arming Horn Beep Canceller bob 144,709 6 *
Wireless Auto Tachometer 353,342 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,739 29 *
Parallel (Printer) Port Interface 299,101 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,311 63 *
3 Channel Spectrum Analyzer 233,341 20
40W Fluorescent Lamp Inverter Bart Milnes 339,867 60 *
Adjustable Strobe Light 320,573 36
Black Light 295,268 29
Colour (Sound) Organ 302,599 36
Electronic Dice NEW! 199,170 10 *
Fantastic Atom Expander 211,537 25
Flash Slave Trigger 231,666 18 *
Infa-Red Remote Control 650,292 216 *
IR Remote Extender NEW! 142,699 3 *
IR Remote Jammer Carl 277,501 110 *
IR Remote Switch NEW! 167,015 9 *
LASER Transmitter/Receiver 429,668 92
LED Chaser 459,245 83 *
LED Metronome NEW! 108,738 3 *
LED Thermometer 215,709 22 *
Light/Dark Detector 315,172 90 *
Simple Colour Organ 146,103 11 *
Strobe Light 285,081 27 *
TRIAC Light Dimmer 565,733 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,625 122 *
Electromagnetic Levitator NEW! 153,474 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,485 214 *
AC Motor Speed Controller 406,681 29 *
Air Flow Detector 261,362 54 *
Digital Keypad Combination Lock 211,188 20
Low Voltage Alarm 239,280 58 *
Pine Racecar Victory Judge 110,932 1 *
Pulse Width Modulation DC Motor Control 668,042 94
Rain Detector 315,111 112 *
Simple Lie Detector 577,393 323
Simple Polarity Tester Dudley LeRoux 175,226 13 *
Simple Servo Controller 232,039 22 *
Simple Touch Switch NEW! 180,219 6 *
Simple Two Speed Contactor DC Motor Controller 215,447 21 *
Stepper Motor Controller 766,778 120 *
Time Delay Relay 567,534 88
Time Delay Relay II jawaharlal@excite.com 257,749 39 *
Touch Switch 300,411 51 *
Video Activated Relay 130,548 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,498 10 *
Water Detector With Sump/Bilge Pump Controller 162,526 18 *
Wire Loop Alarm Alex Meaden 214,766 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,067 25 *
12VDC To 120VAC Inverter 1,560,200 691
6V to 12V Converter 541,628 121
Automatic 12V Lead Acid Battery Charger 951,981 248
Automatic Load Sensing Power Switch 177,474 16 *
Car Battery Charger 896,855 159 *
Dual Polarity Power Supply 383,614 84 *
Fixed Voltage Power Supply 322,050 52 *
High Current Power Supply 353,611 66 *
High Voltage High Current Power Supply 275,008 35 *
LASER Power Supply 307,646 28
Portable CD Player Adapter For Car 222,147 12 *
Power Supply 752,210 259 *
Solid State Tesla Coil NEW! 158,993 4
Solid State Tesla Coil/High Voltage Generator 459,603 51
Transformerless Power Supply 475,125 117 *
Voltage Inverter 355,611 51 *
Voltage Inverter II 214,093 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,110 182
3 Watt FM Transmitter Rae XL Tkacik 351,031 83 *
50 Watt Amplifier 521,566 74
8 Note Tune Player 149,950 12 *
8 Watt Audio Amp 387,902 67 *
Aircraft Radio Communications Receiver 292,524 50 *
Crystal Radio 171,547 53 *
Digital Volume Control 351,139 47 *
Electronic Stethoscope 334,079 142 *
FET Audio Mixer 355,098 41
FM Transmitter 1,031,380 420
Guitar Fuzz Effect 260,449 54 *
Microphone Mixer Anatoly I. Shikhatov 261,541 26 *
Mono To Stereo Synthesizer oRbEq 145,241 18 *
One Tube Regenerative Radio NEW! 162,235 4 *
Op Amp Radio 403,671 80 *
Single Chip AM Radio NEW! 109,878 4 *
Single Chip FM Radio NEW! 185,181 1 *
Sound Level Meter 353,510 51 *
Stereo Tube Amplifier Weslee Kinsler 280,307 15 *
Tone Control 321,921 31
Transistor Organ 211,263 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,250 27 *
FM Telephone Bug 243,690 57
Phone Busy Indicator 223,096 24 *
Remote Telephone Ringer 126,741 3 *
Ringing Phone Light Flasher 230,429 35 *
Simple Phone Tap Derek Tombrello 393,249 98 *
Telephone Hold Button 137,792 10
Telephone Recorder 225,658 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.