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
Thursday, April 23, 2026		 Dual Polarity Power Supply41
6V to 12V Converter41
Yesterday
Wednesday, April 22, 2026		 FM Transmitter31
Phone Busy Indicator31
Of All Time 12VDC To 120VAC Inverter1,563,022
FM Transmitter1,033,662

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,877 61 *
Car Alarm Arming Horn Beep Canceller bob 145,480 6 *
Wireless Auto Tachometer 354,424 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,503 29 *
Parallel (Printer) Port Interface 300,385 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,455 63 *
3 Channel Spectrum Analyzer 234,379 20
40W Fluorescent Lamp Inverter Bart Milnes 340,815 60 *
Adjustable Strobe Light 321,664 36
Black Light 296,510 29
Colour (Sound) Organ 303,844 36
Electronic Dice NEW! 200,223 10 *
Fantastic Atom Expander 212,406 25
Flash Slave Trigger 232,697 18 *
Infa-Red Remote Control 651,497 216 *
IR Remote Extender NEW! 143,663 3 *
IR Remote Jammer Carl 278,642 110 *
IR Remote Switch NEW! 167,907 9 *
LASER Transmitter/Receiver 430,919 92
LED Chaser 460,493 83 *
LED Metronome NEW! 109,718 3 *
LED Thermometer 216,595 22 *
Light/Dark Detector 316,125 90 *
Simple Colour Organ 146,940 11 *
Strobe Light 285,939 27 *
TRIAC Light Dimmer 567,067 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,206 122 *
Electromagnetic Levitator NEW! 154,446 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,228 214 *
AC Motor Speed Controller 408,040 29 *
Air Flow Detector 262,348 54 *
Digital Keypad Combination Lock 212,108 20
Low Voltage Alarm 240,259 58 *
Pine Racecar Victory Judge 111,754 1 *
Pulse Width Modulation DC Motor Control 669,233 94
Rain Detector 316,161 112 *
Simple Lie Detector 578,529 323
Simple Polarity Tester Dudley LeRoux 176,247 13 *
Simple Servo Controller 233,041 22 *
Simple Touch Switch NEW! 181,231 6 *
Simple Two Speed Contactor DC Motor Controller 216,501 21 *
Stepper Motor Controller 768,498 120 *
Time Delay Relay 568,727 88
Time Delay Relay II jawaharlal@excite.com 258,767 39 *
Touch Switch 301,393 51 *
Video Activated Relay 131,298 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,616 10 *
Water Detector With Sump/Bilge Pump Controller 163,558 18 *
Wire Loop Alarm Alex Meaden 215,659 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,834 25 *
12VDC To 120VAC Inverter 1,563,022 691
6V to 12V Converter 543,071 121
Automatic 12V Lead Acid Battery Charger 953,690 248
Automatic Load Sensing Power Switch 178,532 16 *
Car Battery Charger 898,195 159 *
Dual Polarity Power Supply 384,868 84 *
Fixed Voltage Power Supply 322,969 52 *
High Current Power Supply 354,879 66 *
High Voltage High Current Power Supply 276,143 35 *
LASER Power Supply 308,667 28
Portable CD Player Adapter For Car 223,092 12 *
Power Supply 753,534 259 *
Solid State Tesla Coil NEW! 160,398 4
Solid State Tesla Coil/High Voltage Generator 461,232 51
Transformerless Power Supply 476,154 117 *
Voltage Inverter 357,001 51 *
Voltage Inverter II 215,141 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,198 182
3 Watt FM Transmitter Rae XL Tkacik 352,393 83 *
50 Watt Amplifier 522,857 74
8 Note Tune Player 150,821 12 *
8 Watt Audio Amp 389,387 67 *
Aircraft Radio Communications Receiver 293,867 50 *
Crystal Radio 172,928 53 *
Digital Volume Control 352,225 47 *
Electronic Stethoscope 335,596 142 *
FET Audio Mixer 356,155 41
FM Transmitter 1,033,662 420
Guitar Fuzz Effect 261,784 54 *
Microphone Mixer Anatoly I. Shikhatov 262,619 26 *
Mono To Stereo Synthesizer oRbEq 146,349 18 *
One Tube Regenerative Radio NEW! 163,830 4 *
Op Amp Radio 404,976 80 *
Single Chip AM Radio NEW! 110,925 4 *
Single Chip FM Radio NEW! 186,340 1 *
Sound Level Meter 354,740 51 *
Stereo Tube Amplifier Weslee Kinsler 281,479 15 *
Tone Control 323,141 31
Transistor Organ 212,459 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,130 27 *
FM Telephone Bug 244,571 57
Phone Busy Indicator 224,092 24 *
Remote Telephone Ringer 127,666 3 *
Ringing Phone Light Flasher 231,695 35 *
Simple Phone Tap Derek Tombrello 394,197 98 *
Telephone Hold Button 138,652 10
Telephone Recorder 226,515 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.