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, July 10, 2025		 Voltage Inverter35
12V To 24V DC-DC Converter33
Yesterday
Wednesday, July 09, 2025		 Voltage Inverter38
FM Transmitter32
Of All Time 12VDC To 120VAC Inverter1,550,228
FM Transmitter1,023,435

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,663 61 *
Car Alarm Arming Horn Beep Canceller bob 141,669 6 *
Wireless Auto Tachometer 349,493 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,021 29 *
Parallel (Printer) Port Interface 294,338 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,095 63 *
3 Channel Spectrum Analyzer 229,300 20
40W Fluorescent Lamp Inverter Bart Milnes 336,154 60 *
Adjustable Strobe Light 316,536 36
Black Light 290,453 29
Colour (Sound) Organ 298,056 36
Electronic Dice NEW! 195,390 10 *
Fantastic Atom Expander 208,332 25
Flash Slave Trigger 227,824 18 *
Infa-Red Remote Control 645,587 216 *
IR Remote Extender NEW! 139,002 3 *
IR Remote Jammer Carl 273,483 110 *
IR Remote Switch NEW! 163,364 9 *
LASER Transmitter/Receiver 425,293 92
LED Chaser 454,284 83 *
LED Metronome NEW! 105,257 3 *
LED Thermometer 212,535 22 *
Light/Dark Detector 311,782 90 *
Simple Colour Organ 142,829 11 *
Strobe Light 281,688 27 *
TRIAC Light Dimmer 561,262 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,400 122 *
Electromagnetic Levitator NEW! 150,169 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,348 214 *
AC Motor Speed Controller 401,181 29 *
Air Flow Detector 257,889 54 *
Digital Keypad Combination Lock 207,712 20
Low Voltage Alarm 235,414 58 *
Pine Racecar Victory Judge 107,898 1 *
Pulse Width Modulation DC Motor Control 663,155 94
Rain Detector 311,413 112 *
Simple Lie Detector 572,714 323
Simple Polarity Tester Dudley LeRoux 171,353 13 *
Simple Servo Controller 228,144 22 *
Simple Touch Switch NEW! 176,211 6 *
Simple Two Speed Contactor DC Motor Controller 211,665 21 *
Stepper Motor Controller 760,057 120 *
Time Delay Relay 563,388 88
Time Delay Relay II jawaharlal@excite.com 253,902 39 *
Touch Switch 296,571 51 *
Video Activated Relay 127,380 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,051 10 *
Water Detector With Sump/Bilge Pump Controller 158,916 18 *
Wire Loop Alarm Alex Meaden 211,504 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,199 25 *
12VDC To 120VAC Inverter 1,550,228 691
6V to 12V Converter 536,728 121
Automatic 12V Lead Acid Battery Charger 946,724 248
Automatic Load Sensing Power Switch 173,805 16 *
Car Battery Charger 891,953 159 *
Dual Polarity Power Supply 378,858 84 *
Fixed Voltage Power Supply 318,437 52 *
High Current Power Supply 348,538 66 *
High Voltage High Current Power Supply 271,033 35 *
LASER Power Supply 303,824 28
Portable CD Player Adapter For Car 218,478 12 *
Power Supply 747,763 259 *
Solid State Tesla Coil NEW! 154,097 4
Solid State Tesla Coil/High Voltage Generator 454,143 51
Transformerless Power Supply 470,870 117 *
Voltage Inverter 349,851 51 *
Voltage Inverter II 210,402 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,015 182
3 Watt FM Transmitter Rae XL Tkacik 345,398 83 *
50 Watt Amplifier 516,922 74
8 Note Tune Player 146,729 12 *
8 Watt Audio Amp 382,609 67 *
Aircraft Radio Communications Receiver 287,832 50 *
Crystal Radio 166,535 53 *
Digital Volume Control 346,787 47 *
Electronic Stethoscope 329,729 142 *
FET Audio Mixer 351,341 41
FM Transmitter 1,023,435 420
Guitar Fuzz Effect 255,647 54 *
Microphone Mixer Anatoly I. Shikhatov 257,732 26 *
Mono To Stereo Synthesizer oRbEq 141,296 18 *
One Tube Regenerative Radio NEW! 155,680 4 *
Op Amp Radio 399,017 80 *
Single Chip AM Radio NEW! 106,310 4 *
Single Chip FM Radio NEW! 180,529 1 *
Sound Level Meter 349,520 51 *
Stereo Tube Amplifier Weslee Kinsler 275,582 15 *
Tone Control 317,487 31
Transistor Organ 207,371 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,177 27 *
FM Telephone Bug 240,725 57
Phone Busy Indicator 219,885 24 *
Remote Telephone Ringer 123,628 3 *
Ringing Phone Light Flasher 225,978 35 *
Simple Phone Tap Derek Tombrello 389,843 98 *
Telephone Hold Button 134,849 10
Telephone Recorder 222,574 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.