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, April 14, 2026		 AC Motor Speed Controller34
Car Battery Charger20
Yesterday
Monday, April 13, 2026		 FM Transmitter33
One Tube Regenerative Radio32
Of All Time 12VDC To 120VAC Inverter1,562,671
FM Transmitter1,033,309

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,773 61 *
Car Alarm Arming Horn Beep Canceller bob 145,376 6 *
Wireless Auto Tachometer 354,309 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,396 29 *
Parallel (Printer) Port Interface 300,198 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,285 63 *
3 Channel Spectrum Analyzer 234,222 20
40W Fluorescent Lamp Inverter Bart Milnes 340,689 60 *
Adjustable Strobe Light 321,526 36
Black Light 296,338 29
Colour (Sound) Organ 303,697 36
Electronic Dice NEW! 200,072 10 *
Fantastic Atom Expander 212,304 25
Flash Slave Trigger 232,580 18 *
Infa-Red Remote Control 651,299 216 *
IR Remote Extender NEW! 143,523 3 *
IR Remote Jammer Carl 278,487 110 *
IR Remote Switch NEW! 167,778 9 *
LASER Transmitter/Receiver 430,751 92
LED Chaser 460,346 83 *
LED Metronome NEW! 109,548 3 *
LED Thermometer 216,464 22 *
Light/Dark Detector 316,017 90 *
Simple Colour Organ 146,834 11 *
Strobe Light 285,816 27 *
TRIAC Light Dimmer 566,912 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,060 122 *
Electromagnetic Levitator NEW! 154,296 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,994 214 *
AC Motor Speed Controller 407,883 29 *
Air Flow Detector 262,202 54 *
Digital Keypad Combination Lock 211,977 20
Low Voltage Alarm 240,136 58 *
Pine Racecar Victory Judge 111,648 1 *
Pulse Width Modulation DC Motor Control 669,082 94
Rain Detector 316,034 112 *
Simple Lie Detector 578,373 323
Simple Polarity Tester Dudley LeRoux 176,095 13 *
Simple Servo Controller 232,923 22 *
Simple Touch Switch NEW! 181,085 6 *
Simple Two Speed Contactor DC Motor Controller 216,377 21 *
Stepper Motor Controller 768,278 120 *
Time Delay Relay 568,578 88
Time Delay Relay II jawaharlal@excite.com 258,635 39 *
Touch Switch 301,247 51 *
Video Activated Relay 131,190 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,481 10 *
Water Detector With Sump/Bilge Pump Controller 163,430 18 *
Wire Loop Alarm Alex Meaden 215,524 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,613 25 *
12VDC To 120VAC Inverter 1,562,671 691
6V to 12V Converter 542,850 121
Automatic 12V Lead Acid Battery Charger 953,420 248
Automatic Load Sensing Power Switch 178,392 16 *
Car Battery Charger 898,002 159 *
Dual Polarity Power Supply 384,702 84 *
Fixed Voltage Power Supply 322,836 52 *
High Current Power Supply 354,711 66 *
High Voltage High Current Power Supply 276,005 35 *
LASER Power Supply 308,535 28
Portable CD Player Adapter For Car 222,975 12 *
Power Supply 753,360 259 *
Solid State Tesla Coil NEW! 160,225 4
Solid State Tesla Coil/High Voltage Generator 461,023 51
Transformerless Power Supply 476,030 117 *
Voltage Inverter 356,818 51 *
Voltage Inverter II 215,024 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,065 182
3 Watt FM Transmitter Rae XL Tkacik 352,198 83 *
50 Watt Amplifier 522,695 74
8 Note Tune Player 150,719 12 *
8 Watt Audio Amp 389,184 67 *
Aircraft Radio Communications Receiver 293,686 50 *
Crystal Radio 172,744 53 *
Digital Volume Control 352,081 47 *
Electronic Stethoscope 335,356 142 *
FET Audio Mixer 356,044 41
FM Transmitter 1,033,309 420
Guitar Fuzz Effect 261,614 54 *
Microphone Mixer Anatoly I. Shikhatov 262,478 26 *
Mono To Stereo Synthesizer oRbEq 146,200 18 *
One Tube Regenerative Radio NEW! 163,592 4 *
Op Amp Radio 404,810 80 *
Single Chip AM Radio NEW! 110,788 4 *
Single Chip FM Radio NEW! 186,177 1 *
Sound Level Meter 354,571 51 *
Stereo Tube Amplifier Weslee Kinsler 281,332 15 *
Tone Control 322,977 31
Transistor Organ 212,282 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,010 27 *
FM Telephone Bug 244,462 57
Phone Busy Indicator 223,933 24 *
Remote Telephone Ringer 127,545 3 *
Ringing Phone Light Flasher 231,540 35 *
Simple Phone Tap Derek Tombrello 394,070 98 *
Telephone Hold Button 138,532 10
Telephone Recorder 226,399 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.