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
Monday, May 11, 2026		 FM Transmitter8
Voltage Inverter8
Yesterday
Sunday, May 10, 2026		 Colour (Sound) Organ23
12VDC To 120VAC Inverter22
Of All Time 12VDC To 120VAC Inverter1,563,723
FM Transmitter1,034,309

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,079 61 *
Car Alarm Arming Horn Beep Canceller bob 145,683 6 *
Wireless Auto Tachometer 354,639 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,673 29 *
Parallel (Printer) Port Interface 300,667 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,710 63 *
3 Channel Spectrum Analyzer 234,629 20
40W Fluorescent Lamp Inverter Bart Milnes 341,024 60 *
Adjustable Strobe Light 321,889 36
Black Light 296,779 29
Colour (Sound) Organ 304,141 36
Electronic Dice NEW! 200,448 10 *
Fantastic Atom Expander 212,605 25
Flash Slave Trigger 232,930 18 *
Infa-Red Remote Control 651,822 216 *
IR Remote Extender NEW! 143,857 3 *
IR Remote Jammer Carl 278,871 110 *
IR Remote Switch NEW! 168,117 9 *
LASER Transmitter/Receiver 431,172 92
LED Chaser 460,753 83 *
LED Metronome NEW! 109,960 3 *
LED Thermometer 216,791 22 *
Light/Dark Detector 316,313 90 *
Simple Colour Organ 147,145 11 *
Strobe Light 286,119 27 *
TRIAC Light Dimmer 567,331 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,482 122 *
Electromagnetic Levitator NEW! 154,637 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,601 214 *
AC Motor Speed Controller 408,290 29 *
Air Flow Detector 262,596 54 *
Digital Keypad Combination Lock 212,282 20
Low Voltage Alarm 240,456 58 *
Pine Racecar Victory Judge 111,919 1 *
Pulse Width Modulation DC Motor Control 669,500 94
Rain Detector 316,351 112 *
Simple Lie Detector 578,790 323
Simple Polarity Tester Dudley LeRoux 176,473 13 *
Simple Servo Controller 233,255 22 *
Simple Touch Switch NEW! 181,439 6 *
Simple Two Speed Contactor DC Motor Controller 216,709 21 *
Stepper Motor Controller 768,885 120 *
Time Delay Relay 568,953 88
Time Delay Relay II jawaharlal@excite.com 258,978 39 *
Touch Switch 301,590 51 *
Video Activated Relay 131,473 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,888 10 *
Water Detector With Sump/Bilge Pump Controller 163,740 18 *
Wire Loop Alarm Alex Meaden 215,849 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,143 25 *
12VDC To 120VAC Inverter 1,563,723 691
6V to 12V Converter 543,325 121
Automatic 12V Lead Acid Battery Charger 953,988 248
Automatic Load Sensing Power Switch 178,729 16 *
Car Battery Charger 898,465 159 *
Dual Polarity Power Supply 385,151 84 *
Fixed Voltage Power Supply 323,188 52 *
High Current Power Supply 355,156 66 *
High Voltage High Current Power Supply 276,364 35 *
LASER Power Supply 308,912 28
Portable CD Player Adapter For Car 223,285 12 *
Power Supply 753,849 259 *
Solid State Tesla Coil NEW! 160,684 4
Solid State Tesla Coil/High Voltage Generator 461,552 51
Transformerless Power Supply 476,357 117 *
Voltage Inverter 357,296 51 *
Voltage Inverter II 215,383 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,398 182
3 Watt FM Transmitter Rae XL Tkacik 352,672 83 *
50 Watt Amplifier 523,098 74
8 Note Tune Player 150,995 12 *
8 Watt Audio Amp 389,699 67 *
Aircraft Radio Communications Receiver 294,174 50 *
Crystal Radio 173,237 53 *
Digital Volume Control 352,454 47 *
Electronic Stethoscope 335,847 142 *
FET Audio Mixer 356,405 41
FM Transmitter 1,034,309 420
Guitar Fuzz Effect 262,089 54 *
Microphone Mixer Anatoly I. Shikhatov 262,859 26 *
Mono To Stereo Synthesizer oRbEq 146,621 18 *
One Tube Regenerative Radio NEW! 164,160 4 *
Op Amp Radio 405,274 80 *
Single Chip AM Radio NEW! 111,122 4 *
Single Chip FM Radio NEW! 186,601 1 *
Sound Level Meter 354,992 51 *
Stereo Tube Amplifier Weslee Kinsler 281,736 15 *
Tone Control 323,361 31
Transistor Organ 212,701 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,301 27 *
FM Telephone Bug 244,783 57
Phone Busy Indicator 224,302 24 *
Remote Telephone Ringer 127,839 3 *
Ringing Phone Light Flasher 231,958 35 *
Simple Phone Tap Derek Tombrello 394,414 98 *
Telephone Hold Button 138,835 10
Telephone Recorder 226,686 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.