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, May 31, 2025		 Simple Two Speed Contactor DC Motor Controller 1
FET Audio Mixer1
Yesterday
Friday, May 30, 2025		 Digital Volume Control149
LASER Transmitter/Receiver80
Of All Time 12VDC To 120VAC Inverter1,547,393
FM Transmitter1,021,078

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 231,234 61 *
Car Alarm Arming Horn Beep Canceller bob 140,387 6 *
Wireless Auto Tachometer 348,056 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 163,760 29 *
Parallel (Printer) Port Interface 292,806 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 453,556 63 *
3 Channel Spectrum Analyzer 227,804 20
40W Fluorescent Lamp Inverter Bart Milnes 334,741 60 *
Adjustable Strobe Light 314,811 36
Black Light 288,418 29
Colour (Sound) Organ 296,493 36
Electronic Dice NEW! 193,942 10 *
Fantastic Atom Expander 207,068 25
Flash Slave Trigger 226,338 18 *
Infa-Red Remote Control 643,456 216 *
IR Remote Extender NEW! 137,611 3 *
IR Remote Jammer Carl 272,051 110 *
IR Remote Switch NEW! 161,926 9 *
LASER Transmitter/Receiver 423,655 92
LED Chaser 452,623 83 *
LED Metronome NEW! 103,909 3 *
LED Thermometer 211,260 22 *
Light/Dark Detector 310,477 90 *
Simple Colour Organ 141,505 11 *
Strobe Light 280,369 27 *
TRIAC Light Dimmer 559,728 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 365,943 122 *
Electromagnetic Levitator NEW! 148,851 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 930,573 214 *
AC Motor Speed Controller 399,488 29 *
Air Flow Detector 256,549 54 *
Digital Keypad Combination Lock 206,461 20
Low Voltage Alarm 234,013 58 *
Pine Racecar Victory Judge 106,684 1 *
Pulse Width Modulation DC Motor Control 661,585 94
Rain Detector 310,025 112 *
Simple Lie Detector 571,081 323
Simple Polarity Tester Dudley LeRoux 170,058 13 *
Simple Servo Controller 226,691 22 *
Simple Touch Switch NEW! 174,854 6 *
Simple Two Speed Contactor DC Motor Controller 210,213 21 *
Stepper Motor Controller 757,779 120 *
Time Delay Relay 561,849 88
Time Delay Relay II jawaharlal@excite.com 252,508 39 *
Touch Switch 295,126 51 *
Video Activated Relay 126,092 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 186,643 10 *
Water Detector With Sump/Bilge Pump Controller 157,625 18 *
Wire Loop Alarm Alex Meaden 210,168 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 324,590 25 *
12VDC To 120VAC Inverter 1,547,393 691
6V to 12V Converter 535,088 121
Automatic 12V Lead Acid Battery Charger 944,984 248
Automatic Load Sensing Power Switch 172,485 16 *
Car Battery Charger 890,269 159 *
Dual Polarity Power Supply 377,294 84 *
Fixed Voltage Power Supply 317,028 52 *
High Current Power Supply 347,003 66 *
High Voltage High Current Power Supply 269,571 35 *
LASER Power Supply 302,364 28
Portable CD Player Adapter For Car 217,130 12 *
Power Supply 746,322 259 *
Solid State Tesla Coil NEW! 152,564 4
Solid State Tesla Coil/High Voltage Generator 452,352 51
Transformerless Power Supply 469,392 117 *
Voltage Inverter 348,041 51 *
Voltage Inverter II 209,061 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 591,498 182
3 Watt FM Transmitter Rae XL Tkacik 343,663 83 *
50 Watt Amplifier 515,189 74
8 Note Tune Player 145,367 12 *
8 Watt Audio Amp 380,838 67 *
Aircraft Radio Communications Receiver 286,251 50 *
Crystal Radio 164,946 53 *
Digital Volume Control 345,180 47 *
Electronic Stethoscope 328,219 142 *
FET Audio Mixer 349,862 41
FM Transmitter 1,021,078 420
Guitar Fuzz Effect 254,106 54 *
Microphone Mixer Anatoly I. Shikhatov 256,334 26 *
Mono To Stereo Synthesizer oRbEq 139,810 18 *
One Tube Regenerative Radio NEW! 153,502 4 *
Op Amp Radio 397,296 80 *
Single Chip AM Radio NEW! 104,945 4 *
Single Chip FM Radio NEW! 178,996 1 *
Sound Level Meter 348,014 51 *
Stereo Tube Amplifier Weslee Kinsler 274,164 15 *
Tone Control 315,897 31
Transistor Organ 205,894 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 167,920 27 *
FM Telephone Bug 239,487 57
Phone Busy Indicator 218,521 24 *
Remote Telephone Ringer 122,403 3 *
Ringing Phone Light Flasher 224,532 35 *
Simple Phone Tap Derek Tombrello 388,512 98 *
Telephone Hold Button 133,478 10
Telephone Recorder 221,361 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.