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
Thursday, April 30, 2026		 3 Watt FM Transmitter3
LED Metronome2
Yesterday
Wednesday, April 29, 2026		 8 Watt Audio Amp58
12VDC To 120VAC Inverter37
Of All Time 12VDC To 120VAC Inverter1,563,268
FM Transmitter1,033,939

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,952 61 *
Car Alarm Arming Horn Beep Canceller bob 145,560 6 *
Wireless Auto Tachometer 354,515 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,566 29 *
Parallel (Printer) Port Interface 300,476 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,555 63 *
3 Channel Spectrum Analyzer 234,474 20
40W Fluorescent Lamp Inverter Bart Milnes 340,909 60 *
Adjustable Strobe Light 321,772 36
Black Light 296,618 29
Colour (Sound) Organ 303,956 36
Electronic Dice NEW! 200,317 10 *
Fantastic Atom Expander 212,501 25
Flash Slave Trigger 232,792 18 *
Infa-Red Remote Control 651,614 216 *
IR Remote Extender NEW! 143,751 3 *
IR Remote Jammer Carl 278,738 110 *
IR Remote Switch NEW! 167,989 9 *
LASER Transmitter/Receiver 431,035 92
LED Chaser 460,616 83 *
LED Metronome NEW! 109,822 3 *
LED Thermometer 216,685 22 *
Light/Dark Detector 316,218 90 *
Simple Colour Organ 147,029 11 *
Strobe Light 286,025 27 *
TRIAC Light Dimmer 567,172 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,305 122 *
Electromagnetic Levitator NEW! 154,523 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,385 214 *
AC Motor Speed Controller 408,144 29 *
Air Flow Detector 262,459 54 *
Digital Keypad Combination Lock 212,187 20
Low Voltage Alarm 240,341 58 *
Pine Racecar Victory Judge 111,829 1 *
Pulse Width Modulation DC Motor Control 669,325 94
Rain Detector 316,238 112 *
Simple Lie Detector 578,618 323
Simple Polarity Tester Dudley LeRoux 176,338 13 *
Simple Servo Controller 233,126 22 *
Simple Touch Switch NEW! 181,321 6 *
Simple Two Speed Contactor DC Motor Controller 216,582 21 *
Stepper Motor Controller 768,663 120 *
Time Delay Relay 568,829 88
Time Delay Relay II jawaharlal@excite.com 258,855 39 *
Touch Switch 301,467 51 *
Video Activated Relay 131,364 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,716 10 *
Water Detector With Sump/Bilge Pump Controller 163,639 18 *
Wire Loop Alarm Alex Meaden 215,736 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,951 25 *
12VDC To 120VAC Inverter 1,563,268 691
6V to 12V Converter 543,183 121
Automatic 12V Lead Acid Battery Charger 953,825 248
Automatic Load Sensing Power Switch 178,608 16 *
Car Battery Charger 898,298 159 *
Dual Polarity Power Supply 384,974 84 *
Fixed Voltage Power Supply 323,066 52 *
High Current Power Supply 354,997 66 *
High Voltage High Current Power Supply 276,239 35 *
LASER Power Supply 308,770 28
Portable CD Player Adapter For Car 223,174 12 *
Power Supply 753,655 259 *
Solid State Tesla Coil NEW! 160,514 4
Solid State Tesla Coil/High Voltage Generator 461,354 51
Transformerless Power Supply 476,231 117 *
Voltage Inverter 357,122 51 *
Voltage Inverter II 215,235 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,275 182
3 Watt FM Transmitter Rae XL Tkacik 352,505 83 *
50 Watt Amplifier 522,940 74
8 Note Tune Player 150,901 12 *
8 Watt Audio Amp 389,526 67 *
Aircraft Radio Communications Receiver 293,993 50 *
Crystal Radio 173,045 53 *
Digital Volume Control 352,317 47 *
Electronic Stethoscope 335,691 142 *
FET Audio Mixer 356,259 41
FM Transmitter 1,033,939 420
Guitar Fuzz Effect 261,911 54 *
Microphone Mixer Anatoly I. Shikhatov 262,702 26 *
Mono To Stereo Synthesizer oRbEq 146,435 18 *
One Tube Regenerative Radio NEW! 163,955 4 *
Op Amp Radio 405,094 80 *
Single Chip AM Radio NEW! 111,009 4 *
Single Chip FM Radio NEW! 186,446 1 *
Sound Level Meter 354,845 51 *
Stereo Tube Amplifier Weslee Kinsler 281,577 15 *
Tone Control 323,226 31
Transistor Organ 212,543 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,194 27 *
FM Telephone Bug 244,640 57
Phone Busy Indicator 224,182 24 *
Remote Telephone Ringer 127,726 3 *
Ringing Phone Light Flasher 231,798 35 *
Simple Phone Tap Derek Tombrello 394,275 98 *
Telephone Hold Button 138,719 10
Telephone Recorder 226,572 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.