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, March 20, 2026		 One Tube Regenerative Radio5
Single Chip FM Radio5
Yesterday
Thursday, March 19, 2026		 12VDC To 120VAC Inverter40
FM Transmitter39
Of All Time 12VDC To 120VAC Inverter1,561,647
FM Transmitter1,032,507

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,468 61 *
Car Alarm Arming Horn Beep Canceller bob 145,115 6 *
Wireless Auto Tachometer 353,938 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,138 29 *
Parallel (Printer) Port Interface 299,705 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,878 63 *
3 Channel Spectrum Analyzer 233,865 20
40W Fluorescent Lamp Inverter Bart Milnes 340,348 60 *
Adjustable Strobe Light 321,116 36
Black Light 295,895 29
Colour (Sound) Organ 303,240 36
Electronic Dice NEW! 199,666 10 *
Fantastic Atom Expander 211,986 25
Flash Slave Trigger 232,200 18 *
Infa-Red Remote Control 650,867 216 *
IR Remote Extender NEW! 143,194 3 *
IR Remote Jammer Carl 278,049 110 *
IR Remote Switch NEW! 167,460 9 *
LASER Transmitter/Receiver 430,293 92
LED Chaser 459,931 83 *
LED Metronome NEW! 109,215 3 *
LED Thermometer 216,145 22 *
Light/Dark Detector 315,666 90 *
Simple Colour Organ 146,506 11 *
Strobe Light 285,492 27 *
TRIAC Light Dimmer 566,468 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,623 122 *
Electromagnetic Levitator NEW! 153,946 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,349 214 *
AC Motor Speed Controller 407,365 29 *
Air Flow Detector 261,888 54 *
Digital Keypad Combination Lock 211,646 20
Low Voltage Alarm 239,773 58 *
Pine Racecar Victory Judge 111,351 1 *
Pulse Width Modulation DC Motor Control 668,637 94
Rain Detector 315,647 112 *
Simple Lie Detector 577,983 323
Simple Polarity Tester Dudley LeRoux 175,724 13 *
Simple Servo Controller 232,583 22 *
Simple Touch Switch NEW! 180,722 6 *
Simple Two Speed Contactor DC Motor Controller 215,976 21 *
Stepper Motor Controller 767,647 120 *
Time Delay Relay 568,144 88
Time Delay Relay II jawaharlal@excite.com 258,278 39 *
Touch Switch 300,918 51 *
Video Activated Relay 130,932 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,110 10 *
Water Detector With Sump/Bilge Pump Controller 163,047 18 *
Wire Loop Alarm Alex Meaden 215,218 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,005 25 *
12VDC To 120VAC Inverter 1,561,647 691
6V to 12V Converter 542,311 121
Automatic 12V Lead Acid Battery Charger 952,844 248
Automatic Load Sensing Power Switch 178,047 16 *
Car Battery Charger 897,519 159 *
Dual Polarity Power Supply 384,255 84 *
Fixed Voltage Power Supply 322,518 52 *
High Current Power Supply 354,289 66 *
High Voltage High Current Power Supply 275,632 35 *
LASER Power Supply 308,162 28
Portable CD Player Adapter For Car 222,639 12 *
Power Supply 752,868 259 *
Solid State Tesla Coil NEW! 159,703 4
Solid State Tesla Coil/High Voltage Generator 460,400 51
Transformerless Power Supply 475,686 117 *
Voltage Inverter 356,281 51 *
Voltage Inverter II 214,651 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,682 182
3 Watt FM Transmitter Rae XL Tkacik 351,746 83 *
50 Watt Amplifier 522,254 74
8 Note Tune Player 150,419 12 *
8 Watt Audio Amp 388,602 67 *
Aircraft Radio Communications Receiver 293,227 50 *
Crystal Radio 172,285 53 *
Digital Volume Control 351,724 47 *
Electronic Stethoscope 334,779 142 *
FET Audio Mixer 355,648 41
FM Transmitter 1,032,507 420
Guitar Fuzz Effect 261,127 54 *
Microphone Mixer Anatoly I. Shikhatov 262,117 26 *
Mono To Stereo Synthesizer oRbEq 145,814 18 *
One Tube Regenerative Radio NEW! 163,065 4 *
Op Amp Radio 404,367 80 *
Single Chip AM Radio NEW! 110,414 4 *
Single Chip FM Radio NEW! 185,778 1 *
Sound Level Meter 354,180 51 *
Stereo Tube Amplifier Weslee Kinsler 280,930 15 *
Tone Control 322,538 31
Transistor Organ 211,865 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,721 27 *
FM Telephone Bug 244,146 57
Phone Busy Indicator 223,618 24 *
Remote Telephone Ringer 127,236 3 *
Ringing Phone Light Flasher 231,109 35 *
Simple Phone Tap Derek Tombrello 393,764 98 *
Telephone Hold Button 138,230 10
Telephone Recorder 226,115 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.