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, June 08, 2026		 Rain Detector18
12VDC To 120VAC Inverter15
Yesterday
Sunday, June 07, 2026		 12VDC To 120VAC Inverter13
Voltage Inverter9
Of All Time 12VDC To 120VAC Inverter1,564,684
FM Transmitter1,035,689

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,363 61 *
Car Alarm Arming Horn Beep Canceller bob 145,968 6 *
Wireless Auto Tachometer 354,930 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,963 29 *
Parallel (Printer) Port Interface 301,050 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,137 63 *
3 Channel Spectrum Analyzer 235,081 20
40W Fluorescent Lamp Inverter Bart Milnes 341,348 60 *
Adjustable Strobe Light 322,266 36
Black Light 297,223 29
Colour (Sound) Organ 304,503 36
Electronic Dice NEW! 200,816 10 *
Fantastic Atom Expander 212,911 25
Flash Slave Trigger 233,227 18 *
Infa-Red Remote Control 652,195 216 *
IR Remote Extender NEW! 144,165 3 *
IR Remote Jammer Carl 279,241 110 *
IR Remote Switch NEW! 168,439 9 *
LASER Transmitter/Receiver 431,563 92
LED Chaser 461,114 83 *
LED Metronome NEW! 110,311 3 *
LED Thermometer 217,049 22 *
Light/Dark Detector 316,574 90 *
Simple Colour Organ 147,420 11 *
Strobe Light 286,439 27 *
TRIAC Light Dimmer 567,912 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,963 122 *
Electromagnetic Levitator NEW! 154,920 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,128 214 *
AC Motor Speed Controller 408,724 29 *
Air Flow Detector 262,959 54 *
Digital Keypad Combination Lock 212,598 20
Low Voltage Alarm 240,779 58 *
Pine Racecar Victory Judge 112,191 1 *
Pulse Width Modulation DC Motor Control 669,894 94
Rain Detector 316,675 112 *
Simple Lie Detector 579,137 323
Simple Polarity Tester Dudley LeRoux 176,797 13 *
Simple Servo Controller 233,586 22 *
Simple Touch Switch NEW! 181,760 6 *
Simple Two Speed Contactor DC Motor Controller 217,075 21 *
Stepper Motor Controller 769,435 120 *
Time Delay Relay 569,344 88
Time Delay Relay II jawaharlal@excite.com 259,296 39 *
Touch Switch 301,950 51 *
Video Activated Relay 131,767 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,279 10 *
Water Detector With Sump/Bilge Pump Controller 164,034 18 *
Wire Loop Alarm Alex Meaden 216,154 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,627 25 *
12VDC To 120VAC Inverter 1,564,684 691
6V to 12V Converter 543,754 121
Automatic 12V Lead Acid Battery Charger 954,506 248
Automatic Load Sensing Power Switch 179,057 16 *
Car Battery Charger 898,863 159 *
Dual Polarity Power Supply 385,533 84 *
Fixed Voltage Power Supply 323,496 52 *
High Current Power Supply 355,556 66 *
High Voltage High Current Power Supply 276,709 35 *
LASER Power Supply 309,276 28
Portable CD Player Adapter For Car 223,605 12 *
Power Supply 754,298 259 *
Solid State Tesla Coil NEW! 161,081 4
Solid State Tesla Coil/High Voltage Generator 462,150 51
Transformerless Power Supply 476,717 117 *
Voltage Inverter 357,758 51 *
Voltage Inverter II 215,732 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,721 182
3 Watt FM Transmitter Rae XL Tkacik 353,075 83 *
50 Watt Amplifier 523,463 74
8 Note Tune Player 151,321 12 *
8 Watt Audio Amp 390,176 67 *
Aircraft Radio Communications Receiver 294,609 50 *
Crystal Radio 173,714 53 *
Digital Volume Control 352,809 47 *
Electronic Stethoscope 336,426 142 *
FET Audio Mixer 356,759 41
FM Transmitter 1,035,689 420
Guitar Fuzz Effect 262,478 54 *
Microphone Mixer Anatoly I. Shikhatov 263,198 26 *
Mono To Stereo Synthesizer oRbEq 147,036 18 *
One Tube Regenerative Radio NEW! 164,726 4 *
Op Amp Radio 405,709 80 *
Single Chip AM Radio NEW! 111,431 4 *
Single Chip FM Radio NEW! 187,002 1 *
Sound Level Meter 355,340 51 *
Stereo Tube Amplifier Weslee Kinsler 282,088 15 *
Tone Control 323,701 31
Transistor Organ 213,089 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,578 27 *
FM Telephone Bug 245,081 57
Phone Busy Indicator 224,644 24 *
Remote Telephone Ringer 128,097 3 *
Ringing Phone Light Flasher 232,390 35 *
Simple Phone Tap Derek Tombrello 394,702 98 *
Telephone Hold Button 139,137 10
Telephone Recorder 226,995 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.