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
Sunday, August 17, 2025		 12VDC To 120VAC Inverter11
FM Transmitter9
Yesterday
Saturday, August 16, 2025		 Ringing Phone Light Flasher67
Stepper Motor Controller39
Of All Time 12VDC To 120VAC Inverter1,551,654
FM Transmitter1,024,588

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,118 61 *
Car Alarm Arming Horn Beep Canceller bob 142,028 6 *
Wireless Auto Tachometer 349,965 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,386 29 *
Parallel (Printer) Port Interface 294,942 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,578 63 *
3 Channel Spectrum Analyzer 229,829 20
40W Fluorescent Lamp Inverter Bart Milnes 336,605 60 *
Adjustable Strobe Light 317,118 36
Black Light 291,023 29
Colour (Sound) Organ 298,681 36
Electronic Dice NEW! 195,856 10 *
Fantastic Atom Expander 208,681 25
Flash Slave Trigger 228,275 18 *
Infa-Red Remote Control 646,258 216 *
IR Remote Extender NEW! 139,443 3 *
IR Remote Jammer Carl 274,037 110 *
IR Remote Switch NEW! 163,846 9 *
LASER Transmitter/Receiver 425,904 92
LED Chaser 454,884 83 *
LED Metronome NEW! 105,700 3 *
LED Thermometer 212,952 22 *
Light/Dark Detector 312,194 90 *
Simple Colour Organ 143,245 11 *
Strobe Light 282,063 27 *
TRIAC Light Dimmer 561,792 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,885 122 *
Electromagnetic Levitator NEW! 150,594 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,039 214 *
AC Motor Speed Controller 401,923 29 *
Air Flow Detector 258,336 54 *
Digital Keypad Combination Lock 208,154 20
Low Voltage Alarm 235,924 58 *
Pine Racecar Victory Judge 108,243 1 *
Pulse Width Modulation DC Motor Control 663,921 94
Rain Detector 311,851 112 *
Simple Lie Detector 573,347 323
Simple Polarity Tester Dudley LeRoux 171,792 13 *
Simple Servo Controller 228,656 22 *
Simple Touch Switch NEW! 176,748 6 *
Simple Two Speed Contactor DC Motor Controller 212,161 21 *
Stepper Motor Controller 761,022 120 *
Time Delay Relay 563,943 88
Time Delay Relay II jawaharlal@excite.com 254,352 39 *
Touch Switch 297,121 51 *
Video Activated Relay 127,765 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,558 10 *
Water Detector With Sump/Bilge Pump Controller 159,305 18 *
Wire Loop Alarm Alex Meaden 211,948 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 327,007 25 *
12VDC To 120VAC Inverter 1,551,654 691
6V to 12V Converter 537,393 121
Automatic 12V Lead Acid Battery Charger 947,347 248
Automatic Load Sensing Power Switch 174,270 16 *
Car Battery Charger 892,633 159 *
Dual Polarity Power Supply 379,456 84 *
Fixed Voltage Power Supply 318,915 52 *
High Current Power Supply 349,185 66 *
High Voltage High Current Power Supply 271,559 35 *
LASER Power Supply 304,349 28
Portable CD Player Adapter For Car 218,928 12 *
Power Supply 748,331 259 *
Solid State Tesla Coil NEW! 154,746 4
Solid State Tesla Coil/High Voltage Generator 454,890 51
Transformerless Power Supply 471,413 117 *
Voltage Inverter 350,768 51 *
Voltage Inverter II 210,865 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,604 182
3 Watt FM Transmitter Rae XL Tkacik 346,447 83 *
50 Watt Amplifier 517,638 74
8 Note Tune Player 147,089 12 *
8 Watt Audio Amp 383,345 67 *
Aircraft Radio Communications Receiver 288,453 50 *
Crystal Radio 167,131 53 *
Digital Volume Control 347,378 47 *
Electronic Stethoscope 330,298 142 *
FET Audio Mixer 351,805 41
FM Transmitter 1,024,588 420
Guitar Fuzz Effect 256,199 54 *
Microphone Mixer Anatoly I. Shikhatov 258,209 26 *
Mono To Stereo Synthesizer oRbEq 141,784 18 *
One Tube Regenerative Radio NEW! 156,716 4 *
Op Amp Radio 399,677 80 *
Single Chip AM Radio NEW! 106,729 4 *
Single Chip FM Radio NEW! 181,148 1 *
Sound Level Meter 349,984 51 *
Stereo Tube Amplifier Weslee Kinsler 276,111 15 *
Tone Control 318,049 31
Transistor Organ 207,853 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,570 27 *
FM Telephone Bug 241,098 57
Phone Busy Indicator 220,302 24 *
Remote Telephone Ringer 124,033 3 *
Ringing Phone Light Flasher 226,599 35 *
Simple Phone Tap Derek Tombrello 390,305 98 *
Telephone Hold Button 135,238 10
Telephone Recorder 222,985 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.