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, December 15, 2025		 Video Stabilizer/MacroVision Removal19
LED Chaser16
Yesterday
Sunday, December 14, 2025		 Automatic 12V Lead Acid Battery Charger39
FM Transmitter39
Of All Time 12VDC To 120VAC Inverter1,557,497
FM Transmitter1,029,433

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,132 61 *
Car Alarm Arming Horn Beep Canceller bob 143,899 6 *
Wireless Auto Tachometer 352,302 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,036 29 *
Parallel (Printer) Port Interface 297,975 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,249 63 *
3 Channel Spectrum Analyzer 232,302 20
40W Fluorescent Lamp Inverter Bart Milnes 338,791 60 *
Adjustable Strobe Light 319,580 36
Black Light 293,989 29
Colour (Sound) Organ 301,435 36
Electronic Dice NEW! 198,234 10 *
Fantastic Atom Expander 210,688 25
Flash Slave Trigger 230,610 18 *
Infa-Red Remote Control 649,183 216 *
IR Remote Extender NEW! 141,685 3 *
IR Remote Jammer Carl 276,492 110 *
IR Remote Switch NEW! 166,075 9 *
LASER Transmitter/Receiver 428,529 92
LED Chaser 457,957 83 *
LED Metronome NEW! 107,845 3 *
LED Thermometer 214,915 22 *
Light/Dark Detector 314,326 90 *
Simple Colour Organ 145,305 11 *
Strobe Light 284,224 27 *
TRIAC Light Dimmer 564,505 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,568 122 *
Electromagnetic Levitator NEW! 152,596 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,818 214 *
AC Motor Speed Controller 405,394 29 *
Air Flow Detector 260,431 54 *
Digital Keypad Combination Lock 210,286 20
Low Voltage Alarm 238,279 58 *
Pine Racecar Victory Judge 110,146 1 *
Pulse Width Modulation DC Motor Control 666,769 94
Rain Detector 314,173 112 *
Simple Lie Detector 576,158 323
Simple Polarity Tester Dudley LeRoux 174,228 13 *
Simple Servo Controller 230,988 22 *
Simple Touch Switch NEW! 179,107 6 *
Simple Two Speed Contactor DC Motor Controller 214,495 21 *
Stepper Motor Controller 765,207 120 *
Time Delay Relay 566,439 88
Time Delay Relay II jawaharlal@excite.com 256,776 39 *
Touch Switch 299,392 51 *
Video Activated Relay 129,785 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,257 10 *
Water Detector With Sump/Bilge Pump Controller 161,475 18 *
Wire Loop Alarm Alex Meaden 213,940 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,347 25 *
12VDC To 120VAC Inverter 1,557,497 691
6V to 12V Converter 540,327 121
Automatic 12V Lead Acid Battery Charger 950,418 248
Automatic Load Sensing Power Switch 176,532 16 *
Car Battery Charger 895,621 159 *
Dual Polarity Power Supply 382,440 84 *
Fixed Voltage Power Supply 321,154 52 *
High Current Power Supply 352,371 66 *
High Voltage High Current Power Supply 273,901 35 *
LASER Power Supply 306,658 28
Portable CD Player Adapter For Car 221,176 12 *
Power Supply 751,025 259 *
Solid State Tesla Coil NEW! 157,597 4
Solid State Tesla Coil/High Voltage Generator 458,094 51
Transformerless Power Supply 474,018 117 *
Voltage Inverter 354,239 51 *
Voltage Inverter II 213,125 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,998 182
3 Watt FM Transmitter Rae XL Tkacik 349,695 83 *
50 Watt Amplifier 520,405 74
8 Note Tune Player 149,061 12 *
8 Watt Audio Amp 386,584 67 *
Aircraft Radio Communications Receiver 291,247 50 *
Crystal Radio 170,205 53 *
Digital Volume Control 349,974 47 *
Electronic Stethoscope 333,029 142 *
FET Audio Mixer 354,123 41
FM Transmitter 1,029,433 420
Guitar Fuzz Effect 259,214 54 *
Microphone Mixer Anatoly I. Shikhatov 260,542 26 *
Mono To Stereo Synthesizer oRbEq 144,213 18 *
One Tube Regenerative Radio NEW! 160,704 4 *
Op Amp Radio 402,511 80 *
Single Chip AM Radio NEW! 108,856 4 *
Single Chip FM Radio NEW! 183,922 1 *
Sound Level Meter 352,469 51 *
Stereo Tube Amplifier Weslee Kinsler 279,019 15 *
Tone Control 320,709 31
Transistor Organ 210,200 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,454 27 *
FM Telephone Bug 242,876 57
Phone Busy Indicator 222,211 24 *
Remote Telephone Ringer 125,790 3 *
Ringing Phone Light Flasher 229,212 35 *
Simple Phone Tap Derek Tombrello 392,268 98 *
Telephone Hold Button 136,924 10
Telephone Recorder 224,816 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.