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, May 08, 2026		 Transistor Organ11
Simple Colour Organ9
Yesterday
Thursday, May 07, 2026		 Black Light33
Colour (Sound) Organ33
Of All Time 12VDC To 120VAC Inverter1,563,615
FM Transmitter1,034,234

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,038 61 *
Car Alarm Arming Horn Beep Canceller bob 145,653 6 *
Wireless Auto Tachometer 354,614 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,649 29 *
Parallel (Printer) Port Interface 300,630 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,672 63 *
3 Channel Spectrum Analyzer 234,601 20
40W Fluorescent Lamp Inverter Bart Milnes 341,002 60 *
Adjustable Strobe Light 321,858 36
Black Light 296,735 29
Colour (Sound) Organ 304,091 36
Electronic Dice NEW! 200,402 10 *
Fantastic Atom Expander 212,580 25
Flash Slave Trigger 232,896 18 *
Infa-Red Remote Control 651,762 216 *
IR Remote Extender NEW! 143,828 3 *
IR Remote Jammer Carl 278,825 110 *
IR Remote Switch NEW! 168,084 9 *
LASER Transmitter/Receiver 431,139 92
LED Chaser 460,714 83 *
LED Metronome NEW! 109,924 3 *
LED Thermometer 216,766 22 *
Light/Dark Detector 316,288 90 *
Simple Colour Organ 147,120 11 *
Strobe Light 286,094 27 *
TRIAC Light Dimmer 567,300 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 373,433 122 *
Electromagnetic Levitator NEW! 154,607 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 940,554 214 *
AC Motor Speed Controller 408,243 29 *
Air Flow Detector 262,554 54 *
Digital Keypad Combination Lock 212,258 20
Low Voltage Alarm 240,427 58 *
Pine Racecar Victory Judge 111,895 1 *
Pulse Width Modulation DC Motor Control 669,453 94
Rain Detector 316,328 112 *
Simple Lie Detector 578,747 323
Simple Polarity Tester Dudley LeRoux 176,442 13 *
Simple Servo Controller 233,222 22 *
Simple Touch Switch NEW! 181,413 6 *
Simple Two Speed Contactor DC Motor Controller 216,671 21 *
Stepper Motor Controller 768,827 120 *
Time Delay Relay 568,917 88
Time Delay Relay II jawaharlal@excite.com 258,946 39 *
Touch Switch 301,549 51 *
Video Activated Relay 131,435 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,821 10 *
Water Detector With Sump/Bilge Pump Controller 163,712 18 *
Wire Loop Alarm Alex Meaden 215,818 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 335,088 25 *
12VDC To 120VAC Inverter 1,563,615 691
6V to 12V Converter 543,287 121
Automatic 12V Lead Acid Battery Charger 953,937 248
Automatic Load Sensing Power Switch 178,703 16 *
Car Battery Charger 898,424 159 *
Dual Polarity Power Supply 385,102 84 *
Fixed Voltage Power Supply 323,153 52 *
High Current Power Supply 355,113 66 *
High Voltage High Current Power Supply 276,334 35 *
LASER Power Supply 308,872 28
Portable CD Player Adapter For Car 223,252 12 *
Power Supply 753,801 259 *
Solid State Tesla Coil NEW! 160,634 4
Solid State Tesla Coil/High Voltage Generator 461,495 51
Transformerless Power Supply 476,323 117 *
Voltage Inverter 357,237 51 *
Voltage Inverter II 215,344 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 598,363 182
3 Watt FM Transmitter Rae XL Tkacik 352,631 83 *
50 Watt Amplifier 523,058 74
8 Note Tune Player 150,969 12 *
8 Watt Audio Amp 389,663 67 *
Aircraft Radio Communications Receiver 294,119 50 *
Crystal Radio 173,169 53 *
Digital Volume Control 352,413 47 *
Electronic Stethoscope 335,811 142 *
FET Audio Mixer 356,367 41
FM Transmitter 1,034,234 420
Guitar Fuzz Effect 262,050 54 *
Microphone Mixer Anatoly I. Shikhatov 262,819 26 *
Mono To Stereo Synthesizer oRbEq 146,569 18 *
One Tube Regenerative Radio NEW! 164,106 4 *
Op Amp Radio 405,220 80 *
Single Chip AM Radio NEW! 111,095 4 *
Single Chip FM Radio NEW! 186,561 1 *
Sound Level Meter 354,955 51 *
Stereo Tube Amplifier Weslee Kinsler 281,689 15 *
Tone Control 323,326 31
Transistor Organ 212,652 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 173,276 27 *
FM Telephone Bug 244,747 57
Phone Busy Indicator 224,271 24 *
Remote Telephone Ringer 127,813 3 *
Ringing Phone Light Flasher 231,910 35 *
Simple Phone Tap Derek Tombrello 394,375 98 *
Telephone Hold Button 138,802 10
Telephone Recorder 226,659 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.