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 22, 2026		 Automatic 12V Lead Acid Battery Charger19
Solid State Tesla Coil/High Voltage Generator18
Yesterday
Tuesday, April 21, 2026		 12VDC To 120VAC Inverter38
Electronic Stethoscope37
Of All Time 12VDC To 120VAC Inverter1,562,980
FM Transmitter1,033,624

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,864 61 *
Car Alarm Arming Horn Beep Canceller bob 145,465 6 *
Wireless Auto Tachometer 354,400 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,489 29 *
Parallel (Printer) Port Interface 300,341 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,428 63 *
3 Channel Spectrum Analyzer 234,354 20
40W Fluorescent Lamp Inverter Bart Milnes 340,793 60 *
Adjustable Strobe Light 321,651 36
Black Light 296,489 29
Colour (Sound) Organ 303,824 36
Electronic Dice NEW! 200,207 10 *
Fantastic Atom Expander 212,385 25
Flash Slave Trigger 232,681 18 *
Infa-Red Remote Control 651,482 216 *
IR Remote Extender NEW! 143,652 3 *
IR Remote Jammer Carl 278,615 110 *
IR Remote Switch NEW! 167,890 9 *
LASER Transmitter/Receiver 430,897 92
LED Chaser 460,467 83 *
LED Metronome NEW! 109,682 3 *
LED Thermometer 216,577 22 *
Light/Dark Detector 316,100 90 *
Simple Colour Organ 146,924 11 *
Strobe Light 285,925 27 *
TRIAC Light Dimmer 567,046 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,183 122 *
Electromagnetic Levitator NEW! 154,430 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,187 214 *
AC Motor Speed Controller 408,022 29 *
Air Flow Detector 262,334 54 *
Digital Keypad Combination Lock 212,086 20
Low Voltage Alarm 240,243 58 *
Pine Racecar Victory Judge 111,741 1 *
Pulse Width Modulation DC Motor Control 669,209 94
Rain Detector 316,147 112 *
Simple Lie Detector 578,495 323
Simple Polarity Tester Dudley LeRoux 176,220 13 *
Simple Servo Controller 233,018 22 *
Simple Touch Switch NEW! 181,217 6 *
Simple Two Speed Contactor DC Motor Controller 216,485 21 *
Stepper Motor Controller 768,464 120 *
Time Delay Relay 568,704 88
Time Delay Relay II jawaharlal@excite.com 258,750 39 *
Touch Switch 301,373 51 *
Video Activated Relay 131,289 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,596 10 *
Water Detector With Sump/Bilge Pump Controller 163,548 18 *
Wire Loop Alarm Alex Meaden 215,639 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,795 25 *
12VDC To 120VAC Inverter 1,562,980 691
6V to 12V Converter 543,008 121
Automatic 12V Lead Acid Battery Charger 953,657 248
Automatic Load Sensing Power Switch 178,506 16 *
Car Battery Charger 898,161 159 *
Dual Polarity Power Supply 384,814 84 *
Fixed Voltage Power Supply 322,943 52 *
High Current Power Supply 354,845 66 *
High Voltage High Current Power Supply 276,108 35 *
LASER Power Supply 308,643 28
Portable CD Player Adapter For Car 223,070 12 *
Power Supply 753,505 259 *
Solid State Tesla Coil NEW! 160,373 4
Solid State Tesla Coil/High Voltage Generator 461,194 51
Transformerless Power Supply 476,135 117 *
Voltage Inverter 356,984 51 *
Voltage Inverter II 215,119 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,182 182
3 Watt FM Transmitter Rae XL Tkacik 352,372 83 *
50 Watt Amplifier 522,835 74
8 Note Tune Player 150,814 12 *
8 Watt Audio Amp 389,350 67 *
Aircraft Radio Communications Receiver 293,839 50 *
Crystal Radio 172,905 53 *
Digital Volume Control 352,213 47 *
Electronic Stethoscope 335,559 142 *
FET Audio Mixer 356,146 41
FM Transmitter 1,033,624 420
Guitar Fuzz Effect 261,767 54 *
Microphone Mixer Anatoly I. Shikhatov 262,598 26 *
Mono To Stereo Synthesizer oRbEq 146,323 18 *
One Tube Regenerative Radio NEW! 163,792 4 *
Op Amp Radio 404,956 80 *
Single Chip AM Radio NEW! 110,913 4 *
Single Chip FM Radio NEW! 186,322 1 *
Sound Level Meter 354,706 51 *
Stereo Tube Amplifier Weslee Kinsler 281,467 15 *
Tone Control 323,124 31
Transistor Organ 212,440 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,124 27 *
FM Telephone Bug 244,560 57
Phone Busy Indicator 224,060 24 *
Remote Telephone Ringer 127,653 3 *
Ringing Phone Light Flasher 231,667 35 *
Simple Phone Tap Derek Tombrello 394,172 98 *
Telephone Hold Button 138,626 10
Telephone Recorder 226,490 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.