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
Wednesday, April 15, 2026		 FM Transmitter36
12VDC To 120VAC Inverter35
Yesterday
Tuesday, April 14, 2026		 AC Motor Speed Controller35
FM Transmitter31
Of All Time 12VDC To 120VAC Inverter1,562,715
FM Transmitter1,033,361

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,797 61 *
Car Alarm Arming Horn Beep Canceller bob 145,396 6 *
Wireless Auto Tachometer 354,332 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,419 29 *
Parallel (Printer) Port Interface 300,229 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,321 63 *
3 Channel Spectrum Analyzer 234,245 20
40W Fluorescent Lamp Inverter Bart Milnes 340,713 60 *
Adjustable Strobe Light 321,557 36
Black Light 296,360 29
Colour (Sound) Organ 303,725 36
Electronic Dice NEW! 200,095 10 *
Fantastic Atom Expander 212,322 25
Flash Slave Trigger 232,607 18 *
Infa-Red Remote Control 651,328 216 *
IR Remote Extender NEW! 143,553 3 *
IR Remote Jammer Carl 278,526 110 *
IR Remote Switch NEW! 167,799 9 *
LASER Transmitter/Receiver 430,788 92
LED Chaser 460,375 83 *
LED Metronome NEW! 109,585 3 *
LED Thermometer 216,487 22 *
Light/Dark Detector 316,034 90 *
Simple Colour Organ 146,857 11 *
Strobe Light 285,836 27 *
TRIAC Light Dimmer 566,938 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,079 122 *
Electromagnetic Levitator NEW! 154,324 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,033 214 *
AC Motor Speed Controller 407,905 29 *
Air Flow Detector 262,225 54 *
Digital Keypad Combination Lock 212,004 20
Low Voltage Alarm 240,159 58 *
Pine Racecar Victory Judge 111,667 1 *
Pulse Width Modulation DC Motor Control 669,101 94
Rain Detector 316,058 112 *
Simple Lie Detector 578,402 323
Simple Polarity Tester Dudley LeRoux 176,121 13 *
Simple Servo Controller 232,940 22 *
Simple Touch Switch NEW! 181,117 6 *
Simple Two Speed Contactor DC Motor Controller 216,397 21 *
Stepper Motor Controller 768,312 120 *
Time Delay Relay 568,607 88
Time Delay Relay II jawaharlal@excite.com 258,660 39 *
Touch Switch 301,290 51 *
Video Activated Relay 131,214 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,510 10 *
Water Detector With Sump/Bilge Pump Controller 163,458 18 *
Wire Loop Alarm Alex Meaden 215,545 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,636 25 *
12VDC To 120VAC Inverter 1,562,715 691
6V to 12V Converter 542,877 121
Automatic 12V Lead Acid Battery Charger 953,460 248
Automatic Load Sensing Power Switch 178,416 16 *
Car Battery Charger 898,029 159 *
Dual Polarity Power Supply 384,729 84 *
Fixed Voltage Power Supply 322,863 52 *
High Current Power Supply 354,750 66 *
High Voltage High Current Power Supply 276,030 35 *
LASER Power Supply 308,557 28
Portable CD Player Adapter For Car 222,999 12 *
Power Supply 753,397 259 *
Solid State Tesla Coil NEW! 160,247 4
Solid State Tesla Coil/High Voltage Generator 461,052 51
Transformerless Power Supply 476,048 117 *
Voltage Inverter 356,847 51 *
Voltage Inverter II 215,041 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,088 182
3 Watt FM Transmitter Rae XL Tkacik 352,238 83 *
50 Watt Amplifier 522,721 74
8 Note Tune Player 150,739 12 *
8 Watt Audio Amp 389,223 67 *
Aircraft Radio Communications Receiver 293,711 50 *
Crystal Radio 172,789 53 *
Digital Volume Control 352,102 47 *
Electronic Stethoscope 335,394 142 *
FET Audio Mixer 356,064 41
FM Transmitter 1,033,361 420
Guitar Fuzz Effect 261,641 54 *
Microphone Mixer Anatoly I. Shikhatov 262,498 26 *
Mono To Stereo Synthesizer oRbEq 146,225 18 *
One Tube Regenerative Radio NEW! 163,625 4 *
Op Amp Radio 404,829 80 *
Single Chip AM Radio NEW! 110,809 4 *
Single Chip FM Radio NEW! 186,201 1 *
Sound Level Meter 354,598 51 *
Stereo Tube Amplifier Weslee Kinsler 281,357 15 *
Tone Control 323,012 31
Transistor Organ 212,314 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,040 27 *
FM Telephone Bug 244,486 57
Phone Busy Indicator 223,957 24 *
Remote Telephone Ringer 127,567 3 *
Ringing Phone Light Flasher 231,571 35 *
Simple Phone Tap Derek Tombrello 394,089 98 *
Telephone Hold Button 138,553 10
Telephone Recorder 226,424 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.