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, May 01, 2025		 Electronic Stethoscope2
Automatic Load Sensing Power Switch2
Yesterday
Wednesday, April 30, 2025		 12VDC To 120VAC Inverter94
FM Transmitter31
Of All Time 12VDC To 120VAC Inverter1,546,010
FM Transmitter1,020,101

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 230,853 61 *
Car Alarm Arming Horn Beep Canceller bob 140,087 6 *
Wireless Auto Tachometer 347,624 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 163,458 29 *
Parallel (Printer) Port Interface 292,284 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 453,153 63 *
3 Channel Spectrum Analyzer 227,315 20
40W Fluorescent Lamp Inverter Bart Milnes 334,379 60 *
Adjustable Strobe Light 314,366 36
Black Light 287,802 29
Colour (Sound) Organ 296,027 36
Electronic Dice NEW! 193,502 10 *
Fantastic Atom Expander 206,763 25
Flash Slave Trigger 225,965 18 *
Infa-Red Remote Control 642,862 216 *
IR Remote Extender NEW! 137,231 3 *
IR Remote Jammer Carl 271,566 110 *
IR Remote Switch NEW! 161,526 9 *
LASER Transmitter/Receiver 423,048 92
LED Chaser 452,087 83 *
LED Metronome NEW! 103,532 3 *
LED Thermometer 210,923 22 *
Light/Dark Detector 310,145 90 *
Simple Colour Organ 141,153 11 *
Strobe Light 280,019 27 *
TRIAC Light Dimmer 559,246 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 365,498 122 *
Electromagnetic Levitator NEW! 148,492 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 929,729 214 *
AC Motor Speed Controller 398,870 29 *
Air Flow Detector 256,207 54 *
Digital Keypad Combination Lock 206,126 20
Low Voltage Alarm 233,617 58 *
Pine Racecar Victory Judge 106,355 1 *
Pulse Width Modulation DC Motor Control 661,093 94
Rain Detector 309,609 112 *
Simple Lie Detector 570,578 323
Simple Polarity Tester Dudley LeRoux 169,667 13 *
Simple Servo Controller 226,259 22 *
Simple Touch Switch NEW! 174,413 6 *
Simple Two Speed Contactor DC Motor Controller 209,761 21 *
Stepper Motor Controller 756,878 120 *
Time Delay Relay 561,355 88
Time Delay Relay II jawaharlal@excite.com 252,124 39 *
Touch Switch 294,688 51 *
Video Activated Relay 125,757 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 186,267 10 *
Water Detector With Sump/Bilge Pump Controller 157,300 18 *
Wire Loop Alarm Alex Meaden 209,810 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 323,912 25 *
12VDC To 120VAC Inverter 1,546,010 691
6V to 12V Converter 534,554 121
Automatic 12V Lead Acid Battery Charger 944,364 248
Automatic Load Sensing Power Switch 172,071 16 *
Car Battery Charger 889,703 159 *
Dual Polarity Power Supply 376,752 84 *
Fixed Voltage Power Supply 316,626 52 *
High Current Power Supply 346,414 66 *
High Voltage High Current Power Supply 269,111 35 *
LASER Power Supply 301,931 28
Portable CD Player Adapter For Car 216,747 12 *
Power Supply 745,739 259 *
Solid State Tesla Coil NEW! 152,068 4
Solid State Tesla Coil/High Voltage Generator 451,712 51
Transformerless Power Supply 468,886 117 *
Voltage Inverter 347,368 51 *
Voltage Inverter II 208,609 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 591,063 182
3 Watt FM Transmitter Rae XL Tkacik 343,032 83 *
50 Watt Amplifier 514,645 74
8 Note Tune Player 145,007 12 *
8 Watt Audio Amp 380,245 67 *
Aircraft Radio Communications Receiver 285,598 50 *
Crystal Radio 164,460 53 *
Digital Volume Control 344,308 47 *
Electronic Stethoscope 327,698 142 *
FET Audio Mixer 349,348 41
FM Transmitter 1,020,101 420
Guitar Fuzz Effect 253,535 54 *
Microphone Mixer Anatoly I. Shikhatov 255,885 26 *
Mono To Stereo Synthesizer oRbEq 139,343 18 *
One Tube Regenerative Radio NEW! 152,707 4 *
Op Amp Radio 396,673 80 *
Single Chip AM Radio NEW! 104,541 4 *
Single Chip FM Radio NEW! 178,515 1 *
Sound Level Meter 347,492 51 *
Stereo Tube Amplifier Weslee Kinsler 273,747 15 *
Tone Control 315,394 31
Transistor Organ 205,417 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 167,581 27 *
FM Telephone Bug 239,172 57
Phone Busy Indicator 218,151 24 *
Remote Telephone Ringer 122,040 3 *
Ringing Phone Light Flasher 224,059 35 *
Simple Phone Tap Derek Tombrello 388,136 98 *
Telephone Hold Button 133,132 10
Telephone Recorder 220,997 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.