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 18, 2025		 3 Watt FM Transmitter120
Parallel (Printer) Port Interface55
Yesterday
Thursday, July 17, 2025		 Stepper Motor Controller35
12VDC To 120VAC Inverter33
Of All Time 12VDC To 120VAC Inverter1,550,484
FM Transmitter1,023,653

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,754 61 *
Car Alarm Arming Horn Beep Canceller bob 141,738 6 *
Wireless Auto Tachometer 349,595 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,093 29 *
Parallel (Printer) Port Interface 294,502 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,194 63 *
3 Channel Spectrum Analyzer 229,418 20
40W Fluorescent Lamp Inverter Bart Milnes 336,254 60 *
Adjustable Strobe Light 316,659 36
Black Light 290,577 29
Colour (Sound) Organ 298,171 36
Electronic Dice NEW! 195,482 10 *
Fantastic Atom Expander 208,396 25
Flash Slave Trigger 227,913 18 *
Infa-Red Remote Control 645,795 216 *
IR Remote Extender NEW! 139,092 3 *
IR Remote Jammer Carl 273,598 110 *
IR Remote Switch NEW! 163,462 9 *
LASER Transmitter/Receiver 425,435 92
LED Chaser 454,427 83 *
LED Metronome NEW! 105,347 3 *
LED Thermometer 212,612 22 *
Light/Dark Detector 311,869 90 *
Simple Colour Organ 142,915 11 *
Strobe Light 281,766 27 *
TRIAC Light Dimmer 561,376 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,521 122 *
Electromagnetic Levitator NEW! 150,248 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,486 214 *
AC Motor Speed Controller 401,337 29 *
Air Flow Detector 257,984 54 *
Digital Keypad Combination Lock 207,808 20
Low Voltage Alarm 235,519 58 *
Pine Racecar Victory Judge 107,961 1 *
Pulse Width Modulation DC Motor Control 663,350 94
Rain Detector 311,504 112 *
Simple Lie Detector 572,848 323
Simple Polarity Tester Dudley LeRoux 171,442 13 *
Simple Servo Controller 228,257 22 *
Simple Touch Switch NEW! 176,318 6 *
Simple Two Speed Contactor DC Motor Controller 211,765 21 *
Stepper Motor Controller 760,258 120 *
Time Delay Relay 563,504 88
Time Delay Relay II jawaharlal@excite.com 254,005 39 *
Touch Switch 296,685 51 *
Video Activated Relay 127,454 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,168 10 *
Water Detector With Sump/Bilge Pump Controller 158,989 18 *
Wire Loop Alarm Alex Meaden 211,596 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,399 25 *
12VDC To 120VAC Inverter 1,550,484 691
6V to 12V Converter 536,861 121
Automatic 12V Lead Acid Battery Charger 946,856 248
Automatic Load Sensing Power Switch 173,895 16 *
Car Battery Charger 892,123 159 *
Dual Polarity Power Supply 378,973 84 *
Fixed Voltage Power Supply 318,529 52 *
High Current Power Supply 348,675 66 *
High Voltage High Current Power Supply 271,144 35 *
LASER Power Supply 303,926 28
Portable CD Player Adapter For Car 218,564 12 *
Power Supply 747,881 259 *
Solid State Tesla Coil NEW! 154,226 4
Solid State Tesla Coil/High Voltage Generator 454,292 51
Transformerless Power Supply 470,991 117 *
Voltage Inverter 350,054 51 *
Voltage Inverter II 210,493 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,127 182
3 Watt FM Transmitter Rae XL Tkacik 345,672 83 *
50 Watt Amplifier 517,082 74
8 Note Tune Player 146,807 12 *
8 Watt Audio Amp 382,764 67 *
Aircraft Radio Communications Receiver 287,965 50 *
Crystal Radio 166,648 53 *
Digital Volume Control 346,900 47 *
Electronic Stethoscope 329,867 142 *
FET Audio Mixer 351,426 41
FM Transmitter 1,023,653 420
Guitar Fuzz Effect 255,756 54 *
Microphone Mixer Anatoly I. Shikhatov 257,819 26 *
Mono To Stereo Synthesizer oRbEq 141,395 18 *
One Tube Regenerative Radio NEW! 155,883 4 *
Op Amp Radio 399,164 80 *
Single Chip AM Radio NEW! 106,390 4 *
Single Chip FM Radio NEW! 180,650 1 *
Sound Level Meter 349,606 51 *
Stereo Tube Amplifier Weslee Kinsler 275,690 15 *
Tone Control 317,597 31
Transistor Organ 207,447 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,259 27 *
FM Telephone Bug 240,801 57
Phone Busy Indicator 219,965 24 *
Remote Telephone Ringer 123,706 3 *
Ringing Phone Light Flasher 226,084 35 *
Simple Phone Tap Derek Tombrello 389,914 98 *
Telephone Hold Button 134,926 10
Telephone Recorder 222,658 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.