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
Sunday, May 17, 2026		 Colour (Sound) Organ14
Automatic 12V Lead Acid Battery Charger12
Yesterday
Saturday, May 16, 2026		 One Tube Regenerative Radio31
FM Transmitter26
Of All Time 12VDC To 120VAC Inverter1,563,955
FM Transmitter1,034,483

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,152 61 *
Car Alarm Arming Horn Beep Canceller bob 145,734 6 *
Wireless Auto Tachometer 354,699 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,741 29 *
Parallel (Printer) Port Interface 300,755 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,803 63 *
3 Channel Spectrum Analyzer 234,719 20
40W Fluorescent Lamp Inverter Bart Milnes 341,094 60 *
Adjustable Strobe Light 321,966 36
Black Light 296,897 29
Colour (Sound) Organ 304,235 36
Electronic Dice NEW! 200,524 10 *
Fantastic Atom Expander 212,670 25
Flash Slave Trigger 233,001 18 *
Infa-Red Remote Control 651,901 216 *
IR Remote Extender NEW! 143,942 3 *
IR Remote Jammer Carl 278,956 110 *
IR Remote Switch NEW! 168,185 9 *
LASER Transmitter/Receiver 431,261 92
LED Chaser 460,844 83 *
LED Metronome NEW! 110,022 3 *
LED Thermometer 216,855 22 *
Light/Dark Detector 316,367 90 *
Simple Colour Organ 147,207 11 *
Strobe Light 286,193 27 *
TRIAC Light Dimmer 567,527 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,570 122 *
Electromagnetic Levitator NEW! 154,713 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,741 214 *
AC Motor Speed Controller 408,388 29 *
Air Flow Detector 262,680 54 *
Digital Keypad Combination Lock 212,367 20
Low Voltage Alarm 240,526 58 *
Pine Racecar Victory Judge 111,978 1 *
Pulse Width Modulation DC Motor Control 669,569 94
Rain Detector 316,427 112 *
Simple Lie Detector 578,873 323
Simple Polarity Tester Dudley LeRoux 176,562 13 *
Simple Servo Controller 233,347 22 *
Simple Touch Switch NEW! 181,512 6 *
Simple Two Speed Contactor DC Motor Controller 216,783 21 *
Stepper Motor Controller 769,030 120 *
Time Delay Relay 569,041 88
Time Delay Relay II jawaharlal@excite.com 259,063 39 *
Touch Switch 301,669 51 *
Video Activated Relay 131,550 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,989 10 *
Water Detector With Sump/Bilge Pump Controller 163,805 18 *
Wire Loop Alarm Alex Meaden 215,916 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,259 25 *
12VDC To 120VAC Inverter 1,563,955 691
6V to 12V Converter 543,407 121
Automatic 12V Lead Acid Battery Charger 954,100 248
Automatic Load Sensing Power Switch 178,811 16 *
Car Battery Charger 898,544 159 *
Dual Polarity Power Supply 385,232 84 *
Fixed Voltage Power Supply 323,255 52 *
High Current Power Supply 355,255 66 *
High Voltage High Current Power Supply 276,437 35 *
LASER Power Supply 308,997 28
Portable CD Player Adapter For Car 223,352 12 *
Power Supply 753,946 259 *
Solid State Tesla Coil NEW! 160,768 4
Solid State Tesla Coil/High Voltage Generator 461,672 51
Transformerless Power Supply 476,456 117 *
Voltage Inverter 357,420 51 *
Voltage Inverter II 215,466 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,472 182
3 Watt FM Transmitter Rae XL Tkacik 352,782 83 *
50 Watt Amplifier 523,189 74
8 Note Tune Player 151,112 12 *
8 Watt Audio Amp 389,803 67 *
Aircraft Radio Communications Receiver 294,272 50 *
Crystal Radio 173,336 53 *
Digital Volume Control 352,529 47 *
Electronic Stethoscope 335,923 142 *
FET Audio Mixer 356,489 41
FM Transmitter 1,034,483 420
Guitar Fuzz Effect 262,174 54 *
Microphone Mixer Anatoly I. Shikhatov 262,929 26 *
Mono To Stereo Synthesizer oRbEq 146,748 18 *
One Tube Regenerative Radio NEW! 164,303 4 *
Op Amp Radio 405,387 80 *
Single Chip AM Radio NEW! 111,214 4 *
Single Chip FM Radio NEW! 186,686 1 *
Sound Level Meter 355,074 51 *
Stereo Tube Amplifier Weslee Kinsler 281,832 15 *
Tone Control 323,440 31
Transistor Organ 212,791 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,380 27 *
FM Telephone Bug 244,851 57
Phone Busy Indicator 224,375 24 *
Remote Telephone Ringer 127,897 3 *
Ringing Phone Light Flasher 232,070 35 *
Simple Phone Tap Derek Tombrello 394,481 98 *
Telephone Hold Button 138,916 10
Telephone Recorder 226,756 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.