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, June 25, 2025		 Dual Polarity Power Supply4
Colour (Sound) Organ4
Yesterday
Tuesday, June 24, 2025		 FM Transmitter67
8 Watt Audio Amp52
Of All Time 12VDC To 120VAC Inverter1,549,345
FM Transmitter1,022,828

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,425 61 *
Car Alarm Arming Horn Beep Canceller bob 141,507 6 *
Wireless Auto Tachometer 349,237 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,840 29 *
Parallel (Printer) Port Interface 294,027 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,831 63 *
3 Channel Spectrum Analyzer 229,051 20
40W Fluorescent Lamp Inverter Bart Milnes 335,900 60 *
Adjustable Strobe Light 316,259 36
Black Light 290,151 29
Colour (Sound) Organ 297,786 36
Electronic Dice NEW! 195,149 10 *
Fantastic Atom Expander 208,163 25
Flash Slave Trigger 227,555 18 *
Infa-Red Remote Control 645,103 216 *
IR Remote Extender NEW! 138,770 3 *
IR Remote Jammer Carl 273,236 110 *
IR Remote Switch NEW! 163,136 9 *
LASER Transmitter/Receiver 424,977 92
LED Chaser 453,975 83 *
LED Metronome NEW! 105,054 3 *
LED Thermometer 212,345 22 *
Light/Dark Detector 311,598 90 *
Simple Colour Organ 142,636 11 *
Strobe Light 281,512 27 *
TRIAC Light Dimmer 561,007 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,153 122 *
Electromagnetic Levitator NEW! 149,975 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,007 214 *
AC Motor Speed Controller 400,779 29 *
Air Flow Detector 257,627 54 *
Digital Keypad Combination Lock 207,502 20
Low Voltage Alarm 235,156 58 *
Pine Racecar Victory Judge 107,712 1 *
Pulse Width Modulation DC Motor Control 662,841 94
Rain Detector 311,175 112 *
Simple Lie Detector 572,360 323
Simple Polarity Tester Dudley LeRoux 171,134 13 *
Simple Servo Controller 227,872 22 *
Simple Touch Switch NEW! 175,974 6 *
Simple Two Speed Contactor DC Motor Controller 211,402 21 *
Stepper Motor Controller 759,566 120 *
Time Delay Relay 563,063 88
Time Delay Relay II jawaharlal@excite.com 253,635 39 *
Touch Switch 296,254 51 *
Video Activated Relay 127,144 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,759 10 *
Water Detector With Sump/Bilge Pump Controller 158,671 18 *
Wire Loop Alarm Alex Meaden 211,271 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,832 25 *
12VDC To 120VAC Inverter 1,549,345 691
6V to 12V Converter 536,358 121
Automatic 12V Lead Acid Battery Charger 946,313 248
Automatic Load Sensing Power Switch 173,546 16 *
Car Battery Charger 891,543 159 *
Dual Polarity Power Supply 378,495 84 *
Fixed Voltage Power Supply 318,133 52 *
High Current Power Supply 348,184 66 *
High Voltage High Current Power Supply 270,740 35 *
LASER Power Supply 303,523 28
Portable CD Player Adapter For Car 218,229 12 *
Power Supply 747,479 259 *
Solid State Tesla Coil NEW! 153,752 4
Solid State Tesla Coil/High Voltage Generator 453,736 51
Transformerless Power Supply 470,565 117 *
Voltage Inverter 349,378 51 *
Voltage Inverter II 210,131 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,710 182
3 Watt FM Transmitter Rae XL Tkacik 344,992 83 *
50 Watt Amplifier 516,500 74
8 Note Tune Player 146,511 12 *
8 Watt Audio Amp 382,186 67 *
Aircraft Radio Communications Receiver 287,531 50 *
Crystal Radio 166,214 53 *
Digital Volume Control 346,478 47 *
Electronic Stethoscope 329,424 142 *
FET Audio Mixer 351,091 41
FM Transmitter 1,022,828 420
Guitar Fuzz Effect 255,327 54 *
Microphone Mixer Anatoly I. Shikhatov 257,474 26 *
Mono To Stereo Synthesizer oRbEq 141,030 18 *
One Tube Regenerative Radio NEW! 155,212 4 *
Op Amp Radio 398,604 80 *
Single Chip AM Radio NEW! 106,098 4 *
Single Chip FM Radio NEW! 180,213 1 *
Sound Level Meter 349,227 51 *
Stereo Tube Amplifier Weslee Kinsler 275,326 15 *
Tone Control 317,160 31
Transistor Organ 207,100 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,969 27 *
FM Telephone Bug 240,543 57
Phone Busy Indicator 219,661 24 *
Remote Telephone Ringer 123,446 3 *
Ringing Phone Light Flasher 225,710 35 *
Simple Phone Tap Derek Tombrello 389,615 98 *
Telephone Hold Button 134,604 10
Telephone Recorder 222,400 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.