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, October 29, 2026		 Computerize Your Room/Home14
Sound Level Meter14
Yesterday
Wednesday, October 28, 2026		 7 Segment LED Counter66
One Tube Regenerative Radio47
Of All Time 12VDC To 120VAC Inverter1,570,785
FM Transmitter1,039,628

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,383 61 *
Car Alarm Arming Horn Beep Canceller bob 147,819 6 *
Wireless Auto Tachometer 357,205 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,986 29 *
Parallel (Printer) Port Interface 304,030 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 464,023 63 *
3 Channel Spectrum Analyzer 237,765 20
40W Fluorescent Lamp Inverter Bart Milnes 343,481 60 *
Adjustable Strobe Light 324,910 36
Black Light 300,272 29
Colour (Sound) Organ 307,384 36
Electronic Dice NEW! 203,249 10 *
Fantastic Atom Expander 215,105 25
Flash Slave Trigger 236,010 18 *
Infa-Red Remote Control 655,504 216 *
IR Remote Extender NEW! 146,612 3 *
IR Remote Jammer Carl 281,920 110 *
IR Remote Switch NEW! 170,792 9 *
LASER Transmitter/Receiver 434,084 92
LED Chaser 464,293 83 *
LED Metronome NEW! 112,601 3 *
LED Thermometer 219,105 22 *
Light/Dark Detector 318,735 90 *
Simple Colour Organ 149,669 11 *
Strobe Light 288,857 27 *
TRIAC Light Dimmer 571,198 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,934 122 *
Electromagnetic Levitator NEW! 156,953 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,769 214 *
AC Motor Speed Controller 411,508 29 *
Air Flow Detector 265,266 54 *
Digital Keypad Combination Lock 214,658 20
Low Voltage Alarm 243,136 58 *
Pine Racecar Victory Judge 114,374 1 *
Pulse Width Modulation DC Motor Control 672,822 94
Rain Detector 319,196 112 *
Simple Lie Detector 581,662 323
Simple Polarity Tester Dudley LeRoux 179,106 13 *
Simple Servo Controller 236,091 22 *
Simple Touch Switch NEW! 184,133 6 *
Simple Two Speed Contactor DC Motor Controller 219,572 21 *
Stepper Motor Controller 772,951 120 *
Time Delay Relay 572,169 88
Time Delay Relay II jawaharlal@excite.com 261,510 39 *
Touch Switch 304,508 51 *
Video Activated Relay 134,143 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,782 10 *
Water Detector With Sump/Bilge Pump Controller 166,159 18 *
Wire Loop Alarm Alex Meaden 218,498 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 339,101 25 *
12VDC To 120VAC Inverter 1,570,785 691
6V to 12V Converter 546,856 121
Automatic 12V Lead Acid Battery Charger 957,937 248
Automatic Load Sensing Power Switch 181,386 16 *
Car Battery Charger 901,535 159 *
Dual Polarity Power Supply 387,970 84 *
Fixed Voltage Power Supply 325,413 52 *
High Current Power Supply 357,986 66 *
High Voltage High Current Power Supply 278,619 35 *
LASER Power Supply 311,730 28
Portable CD Player Adapter For Car 225,929 12 *
Power Supply 757,026 259 *
Solid State Tesla Coil NEW! 163,585 4
Solid State Tesla Coil/High Voltage Generator 465,636 51
Transformerless Power Supply 478,902 117 *
Voltage Inverter 360,732 51 *
Voltage Inverter II 217,888 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,796 182
3 Watt FM Transmitter Rae XL Tkacik 355,983 83 *
50 Watt Amplifier 525,761 74
8 Note Tune Player 153,262 12 *
8 Watt Audio Amp 392,968 67 *
Aircraft Radio Communications Receiver 297,094 50 *
Crystal Radio 176,125 53 *
Digital Volume Control 355,196 47 *
Electronic Stethoscope 338,989 142 *
FET Audio Mixer 359,043 41
FM Transmitter 1,039,628 420
Guitar Fuzz Effect 265,079 54 *
Microphone Mixer Anatoly I. Shikhatov 265,295 26 *
Mono To Stereo Synthesizer oRbEq 149,241 18 *
One Tube Regenerative Radio NEW! 167,836 4 *
Op Amp Radio 408,441 80 *
Single Chip AM Radio NEW! 113,682 4 *
Single Chip FM Radio NEW! 189,905 1 *
Sound Level Meter 357,662 51 *
Stereo Tube Amplifier Weslee Kinsler 284,162 15 *
Tone Control 326,025 31
Transistor Organ 215,703 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,479 27 *
FM Telephone Bug 247,097 57
Phone Busy Indicator 226,771 24 *
Remote Telephone Ringer 129,935 3 *
Ringing Phone Light Flasher 234,803 35 *
Simple Phone Tap Derek Tombrello 396,650 98 *
Telephone Hold Button 140,849 10
Telephone Recorder 229,148 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.