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
Monday, December 22, 2025		 12VDC To 120VAC Inverter30
7 Segment LED Counter28
Yesterday
Sunday, December 21, 2025		 12VDC To 120VAC Inverter37
12V To 24V DC-DC Converter26
Of All Time 12VDC To 120VAC Inverter1,557,810
FM Transmitter1,029,650

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,233 61 *
Car Alarm Arming Horn Beep Canceller bob 143,995 6 *
Wireless Auto Tachometer 352,409 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,114 29 *
Parallel (Printer) Port Interface 298,133 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,363 63 *
3 Channel Spectrum Analyzer 232,415 20
40W Fluorescent Lamp Inverter Bart Milnes 338,897 60 *
Adjustable Strobe Light 319,691 36
Black Light 294,128 29
Colour (Sound) Organ 301,565 36
Electronic Dice NEW! 198,341 10 *
Fantastic Atom Expander 210,779 25
Flash Slave Trigger 230,722 18 *
Infa-Red Remote Control 649,326 216 *
IR Remote Extender NEW! 141,782 3 *
IR Remote Jammer Carl 276,629 110 *
IR Remote Switch NEW! 166,172 9 *
LASER Transmitter/Receiver 428,644 92
LED Chaser 458,123 83 *
LED Metronome NEW! 107,954 3 *
LED Thermometer 215,001 22 *
Light/Dark Detector 314,429 90 *
Simple Colour Organ 145,405 11 *
Strobe Light 284,311 27 *
TRIAC Light Dimmer 564,646 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,689 122 *
Electromagnetic Levitator NEW! 152,703 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,072 214 *
AC Motor Speed Controller 405,561 29 *
Air Flow Detector 260,541 54 *
Digital Keypad Combination Lock 210,389 20
Low Voltage Alarm 238,409 58 *
Pine Racecar Victory Judge 110,233 1 *
Pulse Width Modulation DC Motor Control 666,900 94
Rain Detector 314,283 112 *
Simple Lie Detector 576,285 323
Simple Polarity Tester Dudley LeRoux 174,344 13 *
Simple Servo Controller 231,118 22 *
Simple Touch Switch NEW! 179,239 6 *
Simple Two Speed Contactor DC Motor Controller 214,600 21 *
Stepper Motor Controller 765,380 120 *
Time Delay Relay 566,589 88
Time Delay Relay II jawaharlal@excite.com 256,895 39 *
Touch Switch 299,528 51 *
Video Activated Relay 129,883 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,389 10 *
Water Detector With Sump/Bilge Pump Controller 161,592 18 *
Wire Loop Alarm Alex Meaden 214,037 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,532 25 *
12VDC To 120VAC Inverter 1,557,810 691
6V to 12V Converter 540,487 121
Automatic 12V Lead Acid Battery Charger 950,586 248
Automatic Load Sensing Power Switch 176,639 16 *
Car Battery Charger 895,747 159 *
Dual Polarity Power Supply 382,587 84 *
Fixed Voltage Power Supply 321,259 52 *
High Current Power Supply 352,514 66 *
High Voltage High Current Power Supply 274,015 35 *
LASER Power Supply 306,766 28
Portable CD Player Adapter For Car 221,315 12 *
Power Supply 751,163 259 *
Solid State Tesla Coil NEW! 157,773 4
Solid State Tesla Coil/High Voltage Generator 458,302 51
Transformerless Power Supply 474,183 117 *
Voltage Inverter 354,405 51 *
Voltage Inverter II 213,261 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,124 182
3 Watt FM Transmitter Rae XL Tkacik 349,882 83 *
50 Watt Amplifier 520,538 74
8 Note Tune Player 149,149 12 *
8 Watt Audio Amp 386,725 67 *
Aircraft Radio Communications Receiver 291,410 50 *
Crystal Radio 170,373 53 *
Digital Volume Control 350,109 47 *
Electronic Stethoscope 333,162 142 *
FET Audio Mixer 354,242 41
FM Transmitter 1,029,650 420
Guitar Fuzz Effect 259,357 54 *
Microphone Mixer Anatoly I. Shikhatov 260,659 26 *
Mono To Stereo Synthesizer oRbEq 144,341 18 *
One Tube Regenerative Radio NEW! 160,898 4 *
Op Amp Radio 402,648 80 *
Single Chip AM Radio NEW! 108,980 4 *
Single Chip FM Radio NEW! 184,075 1 *
Sound Level Meter 352,590 51 *
Stereo Tube Amplifier Weslee Kinsler 279,162 15 *
Tone Control 320,841 31
Transistor Organ 210,325 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,557 27 *
FM Telephone Bug 242,975 57
Phone Busy Indicator 222,316 24 *
Remote Telephone Ringer 125,896 3 *
Ringing Phone Light Flasher 229,335 35 *
Simple Phone Tap Derek Tombrello 392,379 98 *
Telephone Hold Button 137,014 10
Telephone Recorder 224,907 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.