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
Saturday, February 28, 2026		 AC Motor Speed Controller35
12VDC To 120VAC Inverter29
Yesterday
Friday, February 27, 2026		 7 Segment LED Counter39
12VDC To 120VAC Inverter34
Of All Time 12VDC To 120VAC Inverter1,560,836
FM Transmitter1,031,925

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,217 61 *
Car Alarm Arming Horn Beep Canceller bob 144,888 6 *
Wireless Auto Tachometer 353,596 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,899 29 *
Parallel (Printer) Port Interface 299,367 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,544 63 *
3 Channel Spectrum Analyzer 233,579 20
40W Fluorescent Lamp Inverter Bart Milnes 340,062 60 *
Adjustable Strobe Light 320,804 36
Black Light 295,525 29
Colour (Sound) Organ 302,864 36
Electronic Dice NEW! 199,389 10 *
Fantastic Atom Expander 211,730 25
Flash Slave Trigger 231,895 18 *
Infa-Red Remote Control 650,554 216 *
IR Remote Extender NEW! 142,902 3 *
IR Remote Jammer Carl 277,720 110 *
IR Remote Switch NEW! 167,193 9 *
LASER Transmitter/Receiver 429,918 92
LED Chaser 459,560 83 *
LED Metronome NEW! 108,928 3 *
LED Thermometer 215,872 22 *
Light/Dark Detector 315,368 90 *
Simple Colour Organ 146,279 11 *
Strobe Light 285,245 27 *
TRIAC Light Dimmer 566,042 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,872 122 *
Electromagnetic Levitator NEW! 153,646 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,875 214 *
AC Motor Speed Controller 407,006 29 *
Air Flow Detector 261,586 54 *
Digital Keypad Combination Lock 211,351 20
Low Voltage Alarm 239,527 58 *
Pine Racecar Victory Judge 111,110 1 *
Pulse Width Modulation DC Motor Control 668,309 94
Rain Detector 315,322 112 *
Simple Lie Detector 577,646 323
Simple Polarity Tester Dudley LeRoux 175,452 13 *
Simple Servo Controller 232,284 22 *
Simple Touch Switch NEW! 180,445 6 *
Simple Two Speed Contactor DC Motor Controller 215,656 21 *
Stepper Motor Controller 767,159 120 *
Time Delay Relay 567,793 88
Time Delay Relay II jawaharlal@excite.com 257,990 39 *
Touch Switch 300,614 51 *
Video Activated Relay 130,704 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,757 10 *
Water Detector With Sump/Bilge Pump Controller 162,749 18 *
Wire Loop Alarm Alex Meaden 214,948 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,474 25 *
12VDC To 120VAC Inverter 1,560,836 691
6V to 12V Converter 541,925 121
Automatic 12V Lead Acid Battery Charger 952,345 248
Automatic Load Sensing Power Switch 177,709 16 *
Car Battery Charger 897,136 159 *
Dual Polarity Power Supply 383,908 84 *
Fixed Voltage Power Supply 322,257 52 *
High Current Power Supply 353,902 66 *
High Voltage High Current Power Supply 275,254 35 *
LASER Power Supply 307,867 28
Portable CD Player Adapter For Car 222,353 12 *
Power Supply 752,503 259 *
Solid State Tesla Coil NEW! 159,287 4
Solid State Tesla Coil/High Voltage Generator 459,960 51
Transformerless Power Supply 475,378 117 *
Voltage Inverter 355,900 51 *
Voltage Inverter II 214,345 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,365 182
3 Watt FM Transmitter Rae XL Tkacik 351,329 83 *
50 Watt Amplifier 521,867 74
8 Note Tune Player 150,129 12 *
8 Watt Audio Amp 388,198 67 *
Aircraft Radio Communications Receiver 292,780 50 *
Crystal Radio 171,909 53 *
Digital Volume Control 351,408 47 *
Electronic Stethoscope 334,356 142 *
FET Audio Mixer 355,331 41
FM Transmitter 1,031,925 420
Guitar Fuzz Effect 260,751 54 *
Microphone Mixer Anatoly I. Shikhatov 261,798 26 *
Mono To Stereo Synthesizer oRbEq 145,510 18 *
One Tube Regenerative Radio NEW! 162,643 4 *
Op Amp Radio 403,981 80 *
Single Chip AM Radio NEW! 110,104 4 *
Single Chip FM Radio NEW! 185,423 1 *
Sound Level Meter 353,787 51 *
Stereo Tube Amplifier Weslee Kinsler 280,594 15 *
Tone Control 322,202 31
Transistor Organ 211,525 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,454 27 *
FM Telephone Bug 243,873 57
Phone Busy Indicator 223,314 24 *
Remote Telephone Ringer 126,953 3 *
Ringing Phone Light Flasher 230,748 35 *
Simple Phone Tap Derek Tombrello 393,491 98 *
Telephone Hold Button 137,977 10
Telephone Recorder 225,846 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.