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
Tuesday, September 16, 2025		 Black Light40
Guitar Fuzz Effect36
Yesterday
Monday, September 15, 2025		 12VDC To 120VAC Inverter80
12VDC To 120VAC Inverter80
Of All Time 12VDC To 120VAC Inverter1,553,116
FM Transmitter1,025,740

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,665 61 *
Car Alarm Arming Horn Beep Canceller bob 142,475 6 *
Wireless Auto Tachometer 350,554 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,813 29 *
Parallel (Printer) Port Interface 295,718 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,286 63 *
3 Channel Spectrum Analyzer 230,513 20
40W Fluorescent Lamp Inverter Bart Milnes 337,220 60 *
Adjustable Strobe Light 317,834 36
Black Light 291,791 29
Colour (Sound) Organ 299,490 36
Electronic Dice NEW! 196,448 10 *
Fantastic Atom Expander 209,231 25
Flash Slave Trigger 228,926 18 *
Infa-Red Remote Control 647,041 216 *
IR Remote Extender NEW! 140,036 3 *
IR Remote Jammer Carl 274,677 110 *
IR Remote Switch NEW! 164,393 9 *
LASER Transmitter/Receiver 426,612 92
LED Chaser 455,677 83 *
LED Metronome NEW! 106,245 3 *
LED Thermometer 213,500 22 *
Light/Dark Detector 312,787 90 *
Simple Colour Organ 143,770 11 *
Strobe Light 282,706 27 *
TRIAC Light Dimmer 562,510 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,576 122 *
Electromagnetic Levitator NEW! 151,133 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,916 214 *
AC Motor Speed Controller 402,868 29 *
Air Flow Detector 258,903 54 *
Digital Keypad Combination Lock 208,689 20
Low Voltage Alarm 236,536 58 *
Pine Racecar Victory Judge 108,728 1 *
Pulse Width Modulation DC Motor Control 664,745 94
Rain Detector 312,418 112 *
Simple Lie Detector 574,030 323
Simple Polarity Tester Dudley LeRoux 172,353 13 *
Simple Servo Controller 229,308 22 *
Simple Touch Switch NEW! 177,378 6 *
Simple Two Speed Contactor DC Motor Controller 212,751 21 *
Stepper Motor Controller 762,191 120 *
Time Delay Relay 564,611 88
Time Delay Relay II jawaharlal@excite.com 254,955 39 *
Touch Switch 297,714 51 *
Video Activated Relay 128,293 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,184 10 *
Water Detector With Sump/Bilge Pump Controller 159,810 18 *
Wire Loop Alarm Alex Meaden 212,477 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 328,027 25 *
12VDC To 120VAC Inverter 1,553,116 691
6V to 12V Converter 538,155 121
Automatic 12V Lead Acid Battery Charger 948,120 248
Automatic Load Sensing Power Switch 174,881 16 *
Car Battery Charger 893,372 159 *
Dual Polarity Power Supply 380,164 84 *
Fixed Voltage Power Supply 319,540 52 *
High Current Power Supply 350,095 66 *
High Voltage High Current Power Supply 272,154 35 *
LASER Power Supply 304,971 28
Portable CD Player Adapter For Car 219,481 12 *
Power Supply 749,081 259 *
Solid State Tesla Coil NEW! 155,439 4
Solid State Tesla Coil/High Voltage Generator 455,733 51
Transformerless Power Supply 472,024 117 *
Voltage Inverter 351,673 51 *
Voltage Inverter II 211,394 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,240 182
3 Watt FM Transmitter Rae XL Tkacik 347,376 83 *
50 Watt Amplifier 518,371 74
8 Note Tune Player 147,563 12 *
8 Watt Audio Amp 384,290 67 *
Aircraft Radio Communications Receiver 289,283 50 *
Crystal Radio 167,963 53 *
Digital Volume Control 347,996 47 *
Electronic Stethoscope 331,021 142 *
FET Audio Mixer 352,473 41
FM Transmitter 1,025,740 420
Guitar Fuzz Effect 256,958 54 *
Microphone Mixer Anatoly I. Shikhatov 258,813 26 *
Mono To Stereo Synthesizer oRbEq 142,382 18 *
One Tube Regenerative Radio NEW! 157,764 4 *
Op Amp Radio 400,425 80 *
Single Chip AM Radio NEW! 107,287 4 *
Single Chip FM Radio NEW! 181,812 1 *
Sound Level Meter 350,622 51 *
Stereo Tube Amplifier Weslee Kinsler 276,832 15 *
Tone Control 318,716 31
Transistor Organ 208,424 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,058 27 *
FM Telephone Bug 241,655 57
Phone Busy Indicator 220,825 24 *
Remote Telephone Ringer 124,489 3 *
Ringing Phone Light Flasher 227,365 35 *
Simple Phone Tap Derek Tombrello 390,902 98 *
Telephone Hold Button 135,775 10
Telephone Recorder 223,547 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.