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
Friday, July 11, 2025		 LED Chaser9
7 Segment LED Counter7
Yesterday
Thursday, July 10, 2025		 Voltage Inverter37
12V To 24V DC-DC Converter34
Of All Time 12VDC To 120VAC Inverter1,550,236
FM Transmitter1,023,440

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,666 61 *
Car Alarm Arming Horn Beep Canceller bob 141,675 6 *
Wireless Auto Tachometer 349,501 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,022 29 *
Parallel (Printer) Port Interface 294,341 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,100 63 *
3 Channel Spectrum Analyzer 229,303 20
40W Fluorescent Lamp Inverter Bart Milnes 336,159 60 *
Adjustable Strobe Light 316,541 36
Black Light 290,459 29
Colour (Sound) Organ 298,062 36
Electronic Dice NEW! 195,391 10 *
Fantastic Atom Expander 208,335 25
Flash Slave Trigger 227,830 18 *
Infa-Red Remote Control 645,603 216 *
IR Remote Extender NEW! 139,006 3 *
IR Remote Jammer Carl 273,485 110 *
IR Remote Switch NEW! 163,365 9 *
LASER Transmitter/Receiver 425,295 92
LED Chaser 454,294 83 *
LED Metronome NEW! 105,257 3 *
LED Thermometer 212,538 22 *
Light/Dark Detector 311,784 90 *
Simple Colour Organ 142,831 11 *
Strobe Light 281,690 27 *
TRIAC Light Dimmer 561,266 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,405 122 *
Electromagnetic Levitator NEW! 150,174 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,359 214 *
AC Motor Speed Controller 401,183 29 *
Air Flow Detector 257,890 54 *
Digital Keypad Combination Lock 207,713 20
Low Voltage Alarm 235,417 58 *
Pine Racecar Victory Judge 107,902 1 *
Pulse Width Modulation DC Motor Control 663,164 94
Rain Detector 311,415 112 *
Simple Lie Detector 572,721 323
Simple Polarity Tester Dudley LeRoux 171,356 13 *
Simple Servo Controller 228,148 22 *
Simple Touch Switch NEW! 176,220 6 *
Simple Two Speed Contactor DC Motor Controller 211,672 21 *
Stepper Motor Controller 760,066 120 *
Time Delay Relay 563,390 88
Time Delay Relay II jawaharlal@excite.com 253,908 39 *
Touch Switch 296,578 51 *
Video Activated Relay 127,381 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,061 10 *
Water Detector With Sump/Bilge Pump Controller 158,919 18 *
Wire Loop Alarm Alex Meaden 211,505 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,205 25 *
12VDC To 120VAC Inverter 1,550,236 691
6V to 12V Converter 536,731 121
Automatic 12V Lead Acid Battery Charger 946,727 248
Automatic Load Sensing Power Switch 173,809 16 *
Car Battery Charger 891,959 159 *
Dual Polarity Power Supply 378,861 84 *
Fixed Voltage Power Supply 318,439 52 *
High Current Power Supply 348,540 66 *
High Voltage High Current Power Supply 271,036 35 *
LASER Power Supply 303,830 28
Portable CD Player Adapter For Car 218,482 12 *
Power Supply 747,765 259 *
Solid State Tesla Coil NEW! 154,102 4
Solid State Tesla Coil/High Voltage Generator 454,150 51
Transformerless Power Supply 470,873 117 *
Voltage Inverter 349,859 51 *
Voltage Inverter II 210,410 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,016 182
3 Watt FM Transmitter Rae XL Tkacik 345,408 83 *
50 Watt Amplifier 516,924 74
8 Note Tune Player 146,733 12 *
8 Watt Audio Amp 382,619 67 *
Aircraft Radio Communications Receiver 287,838 50 *
Crystal Radio 166,538 53 *
Digital Volume Control 346,791 47 *
Electronic Stethoscope 329,731 142 *
FET Audio Mixer 351,345 41
FM Transmitter 1,023,440 420
Guitar Fuzz Effect 255,650 54 *
Microphone Mixer Anatoly I. Shikhatov 257,737 26 *
Mono To Stereo Synthesizer oRbEq 141,296 18 *
One Tube Regenerative Radio NEW! 155,685 4 *
Op Amp Radio 399,020 80 *
Single Chip AM Radio NEW! 106,312 4 *
Single Chip FM Radio NEW! 180,533 1 *
Sound Level Meter 349,525 51 *
Stereo Tube Amplifier Weslee Kinsler 275,583 15 *
Tone Control 317,494 31
Transistor Organ 207,375 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,183 27 *
FM Telephone Bug 240,729 57
Phone Busy Indicator 219,889 24 *
Remote Telephone Ringer 123,634 3 *
Ringing Phone Light Flasher 225,981 35 *
Simple Phone Tap Derek Tombrello 389,849 98 *
Telephone Hold Button 134,854 10
Telephone Recorder 222,578 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.