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, August 15, 2025		 FM Transmitter24
Colour (Sound) Organ23
Yesterday
Thursday, August 14, 2025		 Pulse Width Modulation DC Motor Control63
12VDC To 120VAC Inverter43
Of All Time 12VDC To 120VAC Inverter1,551,604
FM Transmitter1,024,530

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,096 61 *
Car Alarm Arming Horn Beep Canceller bob 142,016 6 *
Wireless Auto Tachometer 349,944 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,371 29 *
Parallel (Printer) Port Interface 294,921 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,556 63 *
3 Channel Spectrum Analyzer 229,803 20
40W Fluorescent Lamp Inverter Bart Milnes 336,588 60 *
Adjustable Strobe Light 317,095 36
Black Light 290,998 29
Colour (Sound) Organ 298,658 36
Electronic Dice NEW! 195,840 10 *
Fantastic Atom Expander 208,661 25
Flash Slave Trigger 228,247 18 *
Infa-Red Remote Control 646,229 216 *
IR Remote Extender NEW! 139,426 3 *
IR Remote Jammer Carl 274,018 110 *
IR Remote Switch NEW! 163,824 9 *
LASER Transmitter/Receiver 425,873 92
LED Chaser 454,860 83 *
LED Metronome NEW! 105,682 3 *
LED Thermometer 212,932 22 *
Light/Dark Detector 312,172 90 *
Simple Colour Organ 143,227 11 *
Strobe Light 282,050 27 *
TRIAC Light Dimmer 561,761 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,864 122 *
Electromagnetic Levitator NEW! 150,576 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,010 214 *
AC Motor Speed Controller 401,879 29 *
Air Flow Detector 258,313 54 *
Digital Keypad Combination Lock 208,142 20
Low Voltage Alarm 235,903 58 *
Pine Racecar Victory Judge 108,225 1 *
Pulse Width Modulation DC Motor Control 663,884 94
Rain Detector 311,835 112 *
Simple Lie Detector 573,330 323
Simple Polarity Tester Dudley LeRoux 171,775 13 *
Simple Servo Controller 228,641 22 *
Simple Touch Switch NEW! 176,728 6 *
Simple Two Speed Contactor DC Motor Controller 212,149 21 *
Stepper Motor Controller 760,961 120 *
Time Delay Relay 563,925 88
Time Delay Relay II jawaharlal@excite.com 254,339 39 *
Touch Switch 297,099 51 *
Video Activated Relay 127,752 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,541 10 *
Water Detector With Sump/Bilge Pump Controller 159,289 18 *
Wire Loop Alarm Alex Meaden 211,931 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,977 25 *
12VDC To 120VAC Inverter 1,551,604 691
6V to 12V Converter 537,364 121
Automatic 12V Lead Acid Battery Charger 947,326 248
Automatic Load Sensing Power Switch 174,257 16 *
Car Battery Charger 892,604 159 *
Dual Polarity Power Supply 379,428 84 *
Fixed Voltage Power Supply 318,903 52 *
High Current Power Supply 349,162 66 *
High Voltage High Current Power Supply 271,538 35 *
LASER Power Supply 304,330 28
Portable CD Player Adapter For Car 218,911 12 *
Power Supply 748,309 259 *
Solid State Tesla Coil NEW! 154,724 4
Solid State Tesla Coil/High Voltage Generator 454,857 51
Transformerless Power Supply 471,389 117 *
Voltage Inverter 350,741 51 *
Voltage Inverter II 210,851 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,580 182
3 Watt FM Transmitter Rae XL Tkacik 346,415 83 *
50 Watt Amplifier 517,608 74
8 Note Tune Player 147,078 12 *
8 Watt Audio Amp 383,319 67 *
Aircraft Radio Communications Receiver 288,428 50 *
Crystal Radio 167,103 53 *
Digital Volume Control 347,359 47 *
Electronic Stethoscope 330,272 142 *
FET Audio Mixer 351,782 41
FM Transmitter 1,024,530 420
Guitar Fuzz Effect 256,174 54 *
Microphone Mixer Anatoly I. Shikhatov 258,189 26 *
Mono To Stereo Synthesizer oRbEq 141,764 18 *
One Tube Regenerative Radio NEW! 156,669 4 *
Op Amp Radio 399,644 80 *
Single Chip AM Radio NEW! 106,711 4 *
Single Chip FM Radio NEW! 181,121 1 *
Sound Level Meter 349,969 51 *
Stereo Tube Amplifier Weslee Kinsler 276,090 15 *
Tone Control 318,010 31
Transistor Organ 207,839 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,547 27 *
FM Telephone Bug 241,081 57
Phone Busy Indicator 220,281 24 *
Remote Telephone Ringer 124,016 3 *
Ringing Phone Light Flasher 226,519 35 *
Simple Phone Tap Derek Tombrello 390,281 98 *
Telephone Hold Button 135,222 10
Telephone Recorder 222,961 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.