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
Sunday, June 15, 2025		 One Tube Regenerative Radio64
Stepper Motor Controller60
Yesterday
Saturday, June 14, 2025		 One Tube Regenerative Radio102
Stepper Motor Controller93
Of All Time 12VDC To 120VAC Inverter1,548,872
FM Transmitter1,022,419

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,239 61 *
Car Alarm Arming Horn Beep Canceller bob 141,364 6 *
Wireless Auto Tachometer 349,093 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,721 29 *
Parallel (Printer) Port Interface 293,788 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,633 63 *
3 Channel Spectrum Analyzer 228,850 20
40W Fluorescent Lamp Inverter Bart Milnes 335,742 60 *
Adjustable Strobe Light 316,055 36
Black Light 289,904 29
Colour (Sound) Organ 297,556 36
Electronic Dice NEW! 194,957 10 *
Fantastic Atom Expander 208,023 25
Flash Slave Trigger 227,354 18 *
Infa-Red Remote Control 644,766 216 *
IR Remote Extender NEW! 138,589 3 *
IR Remote Jammer Carl 273,066 110 *
IR Remote Switch NEW! 162,914 9 *
LASER Transmitter/Receiver 424,712 92
LED Chaser 453,699 83 *
LED Metronome NEW! 104,856 3 *
LED Thermometer 212,217 22 *
Light/Dark Detector 311,448 90 *
Simple Colour Organ 142,465 11 *
Strobe Light 281,341 27 *
TRIAC Light Dimmer 560,764 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 366,953 122 *
Electromagnetic Levitator NEW! 149,821 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 931,690 214 *
AC Motor Speed Controller 400,538 29 *
Air Flow Detector 257,464 54 *
Digital Keypad Combination Lock 207,351 20
Low Voltage Alarm 234,968 58 *
Pine Racecar Victory Judge 107,582 1 *
Pulse Width Modulation DC Motor Control 662,637 94
Rain Detector 310,978 112 *
Simple Lie Detector 572,113 323
Simple Polarity Tester Dudley LeRoux 170,967 13 *
Simple Servo Controller 227,693 22 *
Simple Touch Switch NEW! 175,812 6 *
Simple Two Speed Contactor DC Motor Controller 211,231 21 *
Stepper Motor Controller 759,172 120 *
Time Delay Relay 562,834 88
Time Delay Relay II jawaharlal@excite.com 253,462 39 *
Touch Switch 296,071 51 *
Video Activated Relay 127,001 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,574 10 *
Water Detector With Sump/Bilge Pump Controller 158,514 18 *
Wire Loop Alarm Alex Meaden 211,112 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,611 25 *
12VDC To 120VAC Inverter 1,548,872 691
6V to 12V Converter 536,111 121
Automatic 12V Lead Acid Battery Charger 946,075 248
Automatic Load Sensing Power Switch 173,402 16 *
Car Battery Charger 891,297 159 *
Dual Polarity Power Supply 378,249 84 *
Fixed Voltage Power Supply 317,962 52 *
High Current Power Supply 348,000 66 *
High Voltage High Current Power Supply 270,518 35 *
LASER Power Supply 303,317 28
Portable CD Player Adapter For Car 218,052 12 *
Power Supply 747,289 259 *
Solid State Tesla Coil NEW! 153,554 4
Solid State Tesla Coil/High Voltage Generator 453,473 51
Transformerless Power Supply 470,361 117 *
Voltage Inverter 349,125 51 *
Voltage Inverter II 209,962 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,494 182
3 Watt FM Transmitter Rae XL Tkacik 344,703 83 *
50 Watt Amplifier 516,240 74
8 Note Tune Player 146,326 12 *
8 Watt Audio Amp 381,918 67 *
Aircraft Radio Communications Receiver 287,271 50 *
Crystal Radio 165,976 53 *
Digital Volume Control 346,209 47 *
Electronic Stethoscope 329,233 142 *
FET Audio Mixer 350,854 41
FM Transmitter 1,022,419 420
Guitar Fuzz Effect 255,110 54 *
Microphone Mixer Anatoly I. Shikhatov 257,283 26 *
Mono To Stereo Synthesizer oRbEq 140,826 18 *
One Tube Regenerative Radio NEW! 154,888 4 *
Op Amp Radio 398,375 80 *
Single Chip AM Radio NEW! 105,900 4 *
Single Chip FM Radio NEW! 179,987 1 *
Sound Level Meter 349,006 51 *
Stereo Tube Amplifier Weslee Kinsler 275,141 15 *
Tone Control 316,912 31
Transistor Organ 206,862 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,839 27 *
FM Telephone Bug 240,432 57
Phone Busy Indicator 219,497 24 *
Remote Telephone Ringer 123,318 3 *
Ringing Phone Light Flasher 225,518 35 *
Simple Phone Tap Derek Tombrello 389,456 98 *
Telephone Hold Button 134,447 10
Telephone Recorder 222,280 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.