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, January 19, 2026		 12VDC To 120VAC Inverter36
12VDC To 120VAC Inverter36
Yesterday
Sunday, January 18, 2026		 12VDC To 120VAC Inverter30
Black Light30
Of All Time 12VDC To 120VAC Inverter1,559,146
FM Transmitter1,030,533

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,657 61 *
Car Alarm Arming Horn Beep Canceller bob 144,374 6 *
Wireless Auto Tachometer 352,927 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,454 29 *
Parallel (Printer) Port Interface 298,682 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,861 63 *
3 Channel Spectrum Analyzer 232,923 20
40W Fluorescent Lamp Inverter Bart Milnes 339,419 60 *
Adjustable Strobe Light 320,166 36
Black Light 294,751 29
Colour (Sound) Organ 302,152 36
Electronic Dice NEW! 198,799 10 *
Fantastic Atom Expander 211,236 25
Flash Slave Trigger 231,236 18 *
Infa-Red Remote Control 649,830 216 *
IR Remote Extender NEW! 142,299 3 *
IR Remote Jammer Carl 277,122 110 *
IR Remote Switch NEW! 166,624 9 *
LASER Transmitter/Receiver 429,174 92
LED Chaser 458,746 83 *
LED Metronome NEW! 108,385 3 *
LED Thermometer 215,364 22 *
Light/Dark Detector 314,837 90 *
Simple Colour Organ 145,783 11 *
Strobe Light 284,738 27 *
TRIAC Light Dimmer 565,225 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,162 122 *
Electromagnetic Levitator NEW! 153,125 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,882 214 *
AC Motor Speed Controller 406,187 29 *
Air Flow Detector 261,014 54 *
Digital Keypad Combination Lock 210,832 20
Low Voltage Alarm 238,921 58 *
Pine Racecar Victory Judge 110,630 1 *
Pulse Width Modulation DC Motor Control 667,511 94
Rain Detector 314,725 112 *
Simple Lie Detector 576,928 323
Simple Polarity Tester Dudley LeRoux 174,847 13 *
Simple Servo Controller 231,683 22 *
Simple Touch Switch NEW! 179,789 6 *
Simple Two Speed Contactor DC Motor Controller 215,067 21 *
Stepper Motor Controller 766,106 120 *
Time Delay Relay 567,109 88
Time Delay Relay II jawaharlal@excite.com 257,394 39 *
Touch Switch 300,014 51 *
Video Activated Relay 130,254 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,019 10 *
Water Detector With Sump/Bilge Pump Controller 162,122 18 *
Wire Loop Alarm Alex Meaden 214,451 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,263 25 *
12VDC To 120VAC Inverter 1,559,146 691
6V to 12V Converter 541,122 121
Automatic 12V Lead Acid Battery Charger 951,366 248
Automatic Load Sensing Power Switch 177,109 16 *
Car Battery Charger 896,340 159 *
Dual Polarity Power Supply 383,166 84 *
Fixed Voltage Power Supply 321,662 52 *
High Current Power Supply 353,140 66 *
High Voltage High Current Power Supply 274,576 35 *
LASER Power Supply 307,248 28
Portable CD Player Adapter For Car 221,766 12 *
Power Supply 751,725 259 *
Solid State Tesla Coil NEW! 158,441 4
Solid State Tesla Coil/High Voltage Generator 459,053 51
Transformerless Power Supply 474,687 117 *
Voltage Inverter 355,060 51 *
Voltage Inverter II 213,740 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,687 182
3 Watt FM Transmitter Rae XL Tkacik 350,527 83 *
50 Watt Amplifier 521,115 74
8 Note Tune Player 149,655 12 *
8 Watt Audio Amp 387,358 67 *
Aircraft Radio Communications Receiver 292,059 50 *
Crystal Radio 171,033 53 *
Digital Volume Control 350,697 47 *
Electronic Stethoscope 333,671 142 *
FET Audio Mixer 354,705 41
FM Transmitter 1,030,533 420
Guitar Fuzz Effect 259,962 54 *
Microphone Mixer Anatoly I. Shikhatov 261,136 26 *
Mono To Stereo Synthesizer oRbEq 144,831 18 *
One Tube Regenerative Radio NEW! 161,660 4 *
Op Amp Radio 403,185 80 *
Single Chip AM Radio NEW! 109,464 4 *
Single Chip FM Radio NEW! 184,739 1 *
Sound Level Meter 353,098 51 *
Stereo Tube Amplifier Weslee Kinsler 279,831 15 *
Tone Control 321,452 31
Transistor Organ 210,849 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,955 27 *
FM Telephone Bug 243,359 57
Phone Busy Indicator 222,719 24 *
Remote Telephone Ringer 126,367 3 *
Ringing Phone Light Flasher 229,916 35 *
Simple Phone Tap Derek Tombrello 392,826 98 *
Telephone Hold Button 137,432 10
Telephone Recorder 225,325 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.