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
Wednesday, December 17, 2025		 7 Segment LED Counter41
FM Transmitter30
Yesterday
Tuesday, December 16, 2025		 12VDC To 120VAC Inverter49
7 Segment LED Counter40
Of All Time 12VDC To 120VAC Inverter1,557,610
FM Transmitter1,029,507

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,169 61 *
Car Alarm Arming Horn Beep Canceller bob 143,927 6 *
Wireless Auto Tachometer 352,343 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,062 29 *
Parallel (Printer) Port Interface 298,036 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,281 63 *
3 Channel Spectrum Analyzer 232,327 20
40W Fluorescent Lamp Inverter Bart Milnes 338,824 60 *
Adjustable Strobe Light 319,618 36
Black Light 294,035 29
Colour (Sound) Organ 301,485 36
Electronic Dice NEW! 198,261 10 *
Fantastic Atom Expander 210,713 25
Flash Slave Trigger 230,645 18 *
Infa-Red Remote Control 649,237 216 *
IR Remote Extender NEW! 141,722 3 *
IR Remote Jammer Carl 276,546 110 *
IR Remote Switch NEW! 166,100 9 *
LASER Transmitter/Receiver 428,577 92
LED Chaser 458,008 83 *
LED Metronome NEW! 107,882 3 *
LED Thermometer 214,942 22 *
Light/Dark Detector 314,362 90 *
Simple Colour Organ 145,337 11 *
Strobe Light 284,250 27 *
TRIAC Light Dimmer 564,542 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,598 122 *
Electromagnetic Levitator NEW! 152,632 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,919 214 *
AC Motor Speed Controller 405,444 29 *
Air Flow Detector 260,469 54 *
Digital Keypad Combination Lock 210,322 20
Low Voltage Alarm 238,318 58 *
Pine Racecar Victory Judge 110,176 1 *
Pulse Width Modulation DC Motor Control 666,807 94
Rain Detector 314,204 112 *
Simple Lie Detector 576,198 323
Simple Polarity Tester Dudley LeRoux 174,265 13 *
Simple Servo Controller 231,033 22 *
Simple Touch Switch NEW! 179,157 6 *
Simple Two Speed Contactor DC Motor Controller 214,530 21 *
Stepper Motor Controller 765,264 120 *
Time Delay Relay 566,484 88
Time Delay Relay II jawaharlal@excite.com 256,812 39 *
Touch Switch 299,440 51 *
Video Activated Relay 129,814 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,302 10 *
Water Detector With Sump/Bilge Pump Controller 161,518 18 *
Wire Loop Alarm Alex Meaden 213,970 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,407 25 *
12VDC To 120VAC Inverter 1,557,610 691
6V to 12V Converter 540,374 121
Automatic 12V Lead Acid Battery Charger 950,475 248
Automatic Load Sensing Power Switch 176,568 16 *
Car Battery Charger 895,662 159 *
Dual Polarity Power Supply 382,478 84 *
Fixed Voltage Power Supply 321,181 52 *
High Current Power Supply 352,428 66 *
High Voltage High Current Power Supply 273,938 35 *
LASER Power Supply 306,690 28
Portable CD Player Adapter For Car 221,217 12 *
Power Supply 751,062 259 *
Solid State Tesla Coil NEW! 157,654 4
Solid State Tesla Coil/High Voltage Generator 458,164 51
Transformerless Power Supply 474,071 117 *
Voltage Inverter 354,284 51 *
Voltage Inverter II 213,162 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,035 182
3 Watt FM Transmitter Rae XL Tkacik 349,751 83 *
50 Watt Amplifier 520,443 74
8 Note Tune Player 149,086 12 *
8 Watt Audio Amp 386,627 67 *
Aircraft Radio Communications Receiver 291,292 50 *
Crystal Radio 170,256 53 *
Digital Volume Control 350,009 47 *
Electronic Stethoscope 333,077 142 *
FET Audio Mixer 354,158 41
FM Transmitter 1,029,507 420
Guitar Fuzz Effect 259,273 54 *
Microphone Mixer Anatoly I. Shikhatov 260,580 26 *
Mono To Stereo Synthesizer oRbEq 144,254 18 *
One Tube Regenerative Radio NEW! 160,756 4 *
Op Amp Radio 402,556 80 *
Single Chip AM Radio NEW! 108,895 4 *
Single Chip FM Radio NEW! 183,946 1 *
Sound Level Meter 352,504 51 *
Stereo Tube Amplifier Weslee Kinsler 279,056 15 *
Tone Control 320,749 31
Transistor Organ 210,236 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,486 27 *
FM Telephone Bug 242,902 57
Phone Busy Indicator 222,242 24 *
Remote Telephone Ringer 125,817 3 *
Ringing Phone Light Flasher 229,252 35 *
Simple Phone Tap Derek Tombrello 392,295 98 *
Telephone Hold Button 136,950 10
Telephone Recorder 224,840 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.