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
Saturday, December 20, 2025		 12VDC To 120VAC Inverter15
Automatic 12V Lead Acid Battery Charger13
Yesterday
Friday, December 19, 2025		 12VDC To 120VAC Inverter46
Voltage Inverter31
Of All Time 12VDC To 120VAC Inverter1,557,719
FM Transmitter1,029,585

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,207 61 *
Car Alarm Arming Horn Beep Canceller bob 143,971 6 *
Wireless Auto Tachometer 352,384 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,096 29 *
Parallel (Printer) Port Interface 298,093 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,337 63 *
3 Channel Spectrum Analyzer 232,371 20
40W Fluorescent Lamp Inverter Bart Milnes 338,868 60 *
Adjustable Strobe Light 319,657 36
Black Light 294,091 29
Colour (Sound) Organ 301,531 36
Electronic Dice NEW! 198,307 10 *
Fantastic Atom Expander 210,756 25
Flash Slave Trigger 230,684 18 *
Infa-Red Remote Control 649,294 216 *
IR Remote Extender NEW! 141,761 3 *
IR Remote Jammer Carl 276,598 110 *
IR Remote Switch NEW! 166,142 9 *
LASER Transmitter/Receiver 428,622 92
LED Chaser 458,078 83 *
LED Metronome NEW! 107,923 3 *
LED Thermometer 214,982 22 *
Light/Dark Detector 314,398 90 *
Simple Colour Organ 145,384 11 *
Strobe Light 284,286 27 *
TRIAC Light Dimmer 564,610 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,635 122 *
Electromagnetic Levitator NEW! 152,671 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,999 214 *
AC Motor Speed Controller 405,513 29 *
Air Flow Detector 260,511 54 *
Digital Keypad Combination Lock 210,357 20
Low Voltage Alarm 238,365 58 *
Pine Racecar Victory Judge 110,215 1 *
Pulse Width Modulation DC Motor Control 666,862 94
Rain Detector 314,245 112 *
Simple Lie Detector 576,236 323
Simple Polarity Tester Dudley LeRoux 174,309 13 *
Simple Servo Controller 231,088 22 *
Simple Touch Switch NEW! 179,204 6 *
Simple Two Speed Contactor DC Motor Controller 214,568 21 *
Stepper Motor Controller 765,339 120 *
Time Delay Relay 566,551 88
Time Delay Relay II jawaharlal@excite.com 256,858 39 *
Touch Switch 299,499 51 *
Video Activated Relay 129,859 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,363 10 *
Water Detector With Sump/Bilge Pump Controller 161,561 18 *
Wire Loop Alarm Alex Meaden 214,004 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,462 25 *
12VDC To 120VAC Inverter 1,557,719 691
6V to 12V Converter 540,438 121
Automatic 12V Lead Acid Battery Charger 950,536 248
Automatic Load Sensing Power Switch 176,613 16 *
Car Battery Charger 895,721 159 *
Dual Polarity Power Supply 382,538 84 *
Fixed Voltage Power Supply 321,231 52 *
High Current Power Supply 352,483 66 *
High Voltage High Current Power Supply 273,979 35 *
LASER Power Supply 306,732 28
Portable CD Player Adapter For Car 221,277 12 *
Power Supply 751,124 259 *
Solid State Tesla Coil NEW! 157,722 4
Solid State Tesla Coil/High Voltage Generator 458,245 51
Transformerless Power Supply 474,140 117 *
Voltage Inverter 354,354 51 *
Voltage Inverter II 213,220 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,083 182
3 Watt FM Transmitter Rae XL Tkacik 349,818 83 *
50 Watt Amplifier 520,495 74
8 Note Tune Player 149,131 12 *
8 Watt Audio Amp 386,673 67 *
Aircraft Radio Communications Receiver 291,358 50 *
Crystal Radio 170,311 53 *
Digital Volume Control 350,066 47 *
Electronic Stethoscope 333,129 142 *
FET Audio Mixer 354,208 41
FM Transmitter 1,029,585 420
Guitar Fuzz Effect 259,315 54 *
Microphone Mixer Anatoly I. Shikhatov 260,623 26 *
Mono To Stereo Synthesizer oRbEq 144,304 18 *
One Tube Regenerative Radio NEW! 160,816 4 *
Op Amp Radio 402,608 80 *
Single Chip AM Radio NEW! 108,943 4 *
Single Chip FM Radio NEW! 184,015 1 *
Sound Level Meter 352,558 51 *
Stereo Tube Amplifier Weslee Kinsler 279,125 15 *
Tone Control 320,803 31
Transistor Organ 210,292 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,524 27 *
FM Telephone Bug 242,933 57
Phone Busy Indicator 222,278 24 *
Remote Telephone Ringer 125,866 3 *
Ringing Phone Light Flasher 229,299 35 *
Simple Phone Tap Derek Tombrello 392,348 98 *
Telephone Hold Button 136,990 10
Telephone Recorder 224,877 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.