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
Friday, May 15, 2026		 One Tube Regenerative Radio12
Electronic Dice12
Yesterday
Thursday, May 14, 2026		 TRIAC Light Dimmer49
FM Transmitter40
Of All Time 12VDC To 120VAC Inverter1,563,899
FM Transmitter1,034,425

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,122 61 *
Car Alarm Arming Horn Beep Canceller bob 145,716 6 *
Wireless Auto Tachometer 354,671 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,718 29 *
Parallel (Printer) Port Interface 300,714 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,768 63 *
3 Channel Spectrum Analyzer 234,687 20
40W Fluorescent Lamp Inverter Bart Milnes 341,074 60 *
Adjustable Strobe Light 321,940 36
Black Light 296,847 29
Colour (Sound) Organ 304,196 36
Electronic Dice NEW! 200,496 10 *
Fantastic Atom Expander 212,639 25
Flash Slave Trigger 232,975 18 *
Infa-Red Remote Control 651,872 216 *
IR Remote Extender NEW! 143,911 3 *
IR Remote Jammer Carl 278,930 110 *
IR Remote Switch NEW! 168,167 9 *
LASER Transmitter/Receiver 431,235 92
LED Chaser 460,817 83 *
LED Metronome NEW! 110,007 3 *
LED Thermometer 216,833 22 *
Light/Dark Detector 316,348 90 *
Simple Colour Organ 147,186 11 *
Strobe Light 286,172 27 *
TRIAC Light Dimmer 567,479 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,539 122 *
Electromagnetic Levitator NEW! 154,681 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,697 214 *
AC Motor Speed Controller 408,355 29 *
Air Flow Detector 262,653 54 *
Digital Keypad Combination Lock 212,339 20
Low Voltage Alarm 240,501 58 *
Pine Racecar Victory Judge 111,957 1 *
Pulse Width Modulation DC Motor Control 669,537 94
Rain Detector 316,399 112 *
Simple Lie Detector 578,848 323
Simple Polarity Tester Dudley LeRoux 176,531 13 *
Simple Servo Controller 233,320 22 *
Simple Touch Switch NEW! 181,483 6 *
Simple Two Speed Contactor DC Motor Controller 216,756 21 *
Stepper Motor Controller 768,983 120 *
Time Delay Relay 569,004 88
Time Delay Relay II jawaharlal@excite.com 259,036 39 *
Touch Switch 301,636 51 *
Video Activated Relay 131,517 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,943 10 *
Water Detector With Sump/Bilge Pump Controller 163,781 18 *
Wire Loop Alarm Alex Meaden 215,887 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,218 25 *
12VDC To 120VAC Inverter 1,563,899 691
6V to 12V Converter 543,382 121
Automatic 12V Lead Acid Battery Charger 954,055 248
Automatic Load Sensing Power Switch 178,795 16 *
Car Battery Charger 898,518 159 *
Dual Polarity Power Supply 385,200 84 *
Fixed Voltage Power Supply 323,224 52 *
High Current Power Supply 355,225 66 *
High Voltage High Current Power Supply 276,413 35 *
LASER Power Supply 308,970 28
Portable CD Player Adapter For Car 223,326 12 *
Power Supply 753,908 259 *
Solid State Tesla Coil NEW! 160,730 4
Solid State Tesla Coil/High Voltage Generator 461,622 51
Transformerless Power Supply 476,422 117 *
Voltage Inverter 357,375 51 *
Voltage Inverter II 215,432 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,449 182
3 Watt FM Transmitter Rae XL Tkacik 352,753 83 *
50 Watt Amplifier 523,157 74
8 Note Tune Player 151,093 12 *
8 Watt Audio Amp 389,768 67 *
Aircraft Radio Communications Receiver 294,251 50 *
Crystal Radio 173,299 53 *
Digital Volume Control 352,501 47 *
Electronic Stethoscope 335,897 142 *
FET Audio Mixer 356,463 41
FM Transmitter 1,034,425 420
Guitar Fuzz Effect 262,149 54 *
Microphone Mixer Anatoly I. Shikhatov 262,899 26 *
Mono To Stereo Synthesizer oRbEq 146,704 18 *
One Tube Regenerative Radio NEW! 164,248 4 *
Op Amp Radio 405,337 80 *
Single Chip AM Radio NEW! 111,181 4 *
Single Chip FM Radio NEW! 186,649 1 *
Sound Level Meter 355,045 51 *
Stereo Tube Amplifier Weslee Kinsler 281,804 15 *
Tone Control 323,417 31
Transistor Organ 212,753 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,355 27 *
FM Telephone Bug 244,827 57
Phone Busy Indicator 224,350 24 *
Remote Telephone Ringer 127,872 3 *
Ringing Phone Light Flasher 232,037 35 *
Simple Phone Tap Derek Tombrello 394,464 98 *
Telephone Hold Button 138,890 10
Telephone Recorder 226,732 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.