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
Sunday, March 30, 2025		 Remote Telephone Ringer5
Telephone Hold Button5
Yesterday
Saturday, March 29, 2025		 12VDC To 120VAC Inverter46
Stepper Motor Controller31
Of All Time 12VDC To 120VAC Inverter1,544,461
FM Transmitter1,019,227

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 230,519 61 *
Car Alarm Arming Horn Beep Canceller bob 139,787 6 *
Wireless Auto Tachometer 347,226 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 163,158 29 *
Parallel (Printer) Port Interface 291,790 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 452,696 63 *
3 Channel Spectrum Analyzer 226,802 20
40W Fluorescent Lamp Inverter Bart Milnes 334,019 60 *
Adjustable Strobe Light 313,889 36
Black Light 287,234 29
Colour (Sound) Organ 295,617 36
Electronic Dice NEW! 193,125 10 *
Fantastic Atom Expander 206,422 25
Flash Slave Trigger 225,570 18 *
Infa-Red Remote Control 642,345 216 *
IR Remote Extender NEW! 136,845 3 *
IR Remote Jammer Carl 271,098 110 *
IR Remote Switch NEW! 161,185 9 *
LASER Transmitter/Receiver 422,530 92
LED Chaser 451,611 83 *
LED Metronome NEW! 103,183 3 *
LED Thermometer 210,586 22 *
Light/Dark Detector 309,801 90 *
Simple Colour Organ 140,830 11 *
Strobe Light 279,625 27 *
TRIAC Light Dimmer 558,772 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 365,059 122 *
Electromagnetic Levitator NEW! 148,137 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 929,087 214 *
AC Motor Speed Controller 398,318 29 *
Air Flow Detector 255,859 54 *
Digital Keypad Combination Lock 205,812 20
Low Voltage Alarm 233,264 58 *
Pine Racecar Victory Judge 106,041 1 *
Pulse Width Modulation DC Motor Control 660,601 94
Rain Detector 309,195 112 *
Simple Lie Detector 570,061 323
Simple Polarity Tester Dudley LeRoux 169,341 13 *
Simple Servo Controller 225,802 22 *
Simple Touch Switch NEW! 174,034 6 *
Simple Two Speed Contactor DC Motor Controller 209,356 21 *
Stepper Motor Controller 756,009 120 *
Time Delay Relay 560,847 88
Time Delay Relay II jawaharlal@excite.com 251,770 39 *
Touch Switch 294,262 51 *
Video Activated Relay 125,456 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 185,880 10 *
Water Detector With Sump/Bilge Pump Controller 156,980 18 *
Wire Loop Alarm Alex Meaden 209,464 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 323,295 25 *
12VDC To 120VAC Inverter 1,544,461 691
6V to 12V Converter 533,995 121
Automatic 12V Lead Acid Battery Charger 943,797 248
Automatic Load Sensing Power Switch 171,712 16 *
Car Battery Charger 889,165 159 *
Dual Polarity Power Supply 376,287 84 *
Fixed Voltage Power Supply 316,245 52 *
High Current Power Supply 345,871 66 *
High Voltage High Current Power Supply 268,690 35 *
LASER Power Supply 301,488 28
Portable CD Player Adapter For Car 216,384 12 *
Power Supply 745,163 259 *
Solid State Tesla Coil NEW! 151,590 4
Solid State Tesla Coil/High Voltage Generator 451,078 51
Transformerless Power Supply 468,403 117 *
Voltage Inverter 346,634 51 *
Voltage Inverter II 208,165 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 590,584 182
3 Watt FM Transmitter Rae XL Tkacik 342,464 83 *
50 Watt Amplifier 514,135 74
8 Note Tune Player 144,658 12 *
8 Watt Audio Amp 379,725 67 *
Aircraft Radio Communications Receiver 285,095 50 *
Crystal Radio 163,983 53 *
Digital Volume Control 343,875 47 *
Electronic Stethoscope 327,252 142 *
FET Audio Mixer 348,862 41
FM Transmitter 1,019,227 420
Guitar Fuzz Effect 252,981 54 *
Microphone Mixer Anatoly I. Shikhatov 255,467 26 *
Mono To Stereo Synthesizer oRbEq 138,935 18 *
One Tube Regenerative Radio NEW! 151,940 4 *
Op Amp Radio 396,079 80 *
Single Chip AM Radio NEW! 104,174 4 *
Single Chip FM Radio NEW! 178,022 1 *
Sound Level Meter 347,038 51 *
Stereo Tube Amplifier Weslee Kinsler 273,336 15 *
Tone Control 314,973 31
Transistor Organ 204,901 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 167,280 27 *
FM Telephone Bug 238,847 57
Phone Busy Indicator 217,795 24 *
Remote Telephone Ringer 121,749 3 *
Ringing Phone Light Flasher 223,630 35 *
Simple Phone Tap Derek Tombrello 387,756 98 *
Telephone Hold Button 132,808 10
Telephone Recorder 220,637 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.