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 14, 2026		 FM Transmitter22
TRIAC Light Dimmer22
Yesterday
Wednesday, May 13, 2026		 12VDC To 120VAC Inverter47
TRIAC Light Dimmer33
Of All Time 12VDC To 120VAC Inverter1,563,859
FM Transmitter1,034,395

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,113 61 *
Car Alarm Arming Horn Beep Canceller bob 145,706 6 *
Wireless Auto Tachometer 354,661 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,709 29 *
Parallel (Printer) Port Interface 300,697 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,756 63 *
3 Channel Spectrum Analyzer 234,667 20
40W Fluorescent Lamp Inverter Bart Milnes 341,057 60 *
Adjustable Strobe Light 321,933 36
Black Light 296,822 29
Colour (Sound) Organ 304,182 36
Electronic Dice NEW! 200,479 10 *
Fantastic Atom Expander 212,630 25
Flash Slave Trigger 232,966 18 *
Infa-Red Remote Control 651,862 216 *
IR Remote Extender NEW! 143,900 3 *
IR Remote Jammer Carl 278,912 110 *
IR Remote Switch NEW! 168,156 9 *
LASER Transmitter/Receiver 431,226 92
LED Chaser 460,791 83 *
LED Metronome NEW! 110,001 3 *
LED Thermometer 216,826 22 *
Light/Dark Detector 316,339 90 *
Simple Colour Organ 147,178 11 *
Strobe Light 286,156 27 *
TRIAC Light Dimmer 567,449 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,524 122 *
Electromagnetic Levitator NEW! 154,673 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,683 214 *
AC Motor Speed Controller 408,335 29 *
Air Flow Detector 262,635 54 *
Digital Keypad Combination Lock 212,326 20
Low Voltage Alarm 240,491 58 *
Pine Racecar Victory Judge 111,948 1 *
Pulse Width Modulation DC Motor Control 669,529 94
Rain Detector 316,389 112 *
Simple Lie Detector 578,827 323
Simple Polarity Tester Dudley LeRoux 176,512 13 *
Simple Servo Controller 233,301 22 *
Simple Touch Switch NEW! 181,474 6 *
Simple Two Speed Contactor DC Motor Controller 216,745 21 *
Stepper Motor Controller 768,951 120 *
Time Delay Relay 568,985 88
Time Delay Relay II jawaharlal@excite.com 259,012 39 *
Touch Switch 301,625 51 *
Video Activated Relay 131,504 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,928 10 *
Water Detector With Sump/Bilge Pump Controller 163,771 18 *
Wire Loop Alarm Alex Meaden 215,878 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,197 25 *
12VDC To 120VAC Inverter 1,563,859 691
6V to 12V Converter 543,361 121
Automatic 12V Lead Acid Battery Charger 954,031 248
Automatic Load Sensing Power Switch 178,781 16 *
Car Battery Charger 898,500 159 *
Dual Polarity Power Supply 385,186 84 *
Fixed Voltage Power Supply 323,216 52 *
High Current Power Supply 355,208 66 *
High Voltage High Current Power Supply 276,399 35 *
LASER Power Supply 308,959 28
Portable CD Player Adapter For Car 223,317 12 *
Power Supply 753,890 259 *
Solid State Tesla Coil NEW! 160,712 4
Solid State Tesla Coil/High Voltage Generator 461,600 51
Transformerless Power Supply 476,406 117 *
Voltage Inverter 357,357 51 *
Voltage Inverter II 215,420 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,433 182
3 Watt FM Transmitter Rae XL Tkacik 352,732 83 *
50 Watt Amplifier 523,141 74
8 Note Tune Player 151,070 12 *
8 Watt Audio Amp 389,744 67 *
Aircraft Radio Communications Receiver 294,235 50 *
Crystal Radio 173,278 53 *
Digital Volume Control 352,485 47 *
Electronic Stethoscope 335,880 142 *
FET Audio Mixer 356,446 41
FM Transmitter 1,034,395 420
Guitar Fuzz Effect 262,136 54 *
Microphone Mixer Anatoly I. Shikhatov 262,885 26 *
Mono To Stereo Synthesizer oRbEq 146,670 18 *
One Tube Regenerative Radio NEW! 164,220 4 *
Op Amp Radio 405,314 80 *
Single Chip AM Radio NEW! 111,162 4 *
Single Chip FM Radio NEW! 186,634 1 *
Sound Level Meter 355,028 51 *
Stereo Tube Amplifier Weslee Kinsler 281,785 15 *
Tone Control 323,404 31
Transistor Organ 212,737 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,335 27 *
FM Telephone Bug 244,812 57
Phone Busy Indicator 224,331 24 *
Remote Telephone Ringer 127,861 3 *
Ringing Phone Light Flasher 232,022 35 *
Simple Phone Tap Derek Tombrello 394,454 98 *
Telephone Hold Button 138,877 10
Telephone Recorder 226,719 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.