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
Monday, December 08, 2025		 One Tube Regenerative Radio16
Stereo Tube Amplifier13
Yesterday
Sunday, December 07, 2025		 12VDC To 120VAC Inverter62
7 Segment LED Counter42
Of All Time 12VDC To 120VAC Inverter1,557,213
FM Transmitter1,029,222

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,047 61 *
Car Alarm Arming Horn Beep Canceller bob 143,806 6 *
Wireless Auto Tachometer 352,181 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,968 29 *
Parallel (Printer) Port Interface 297,845 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,130 63 *
3 Channel Spectrum Analyzer 232,179 20
40W Fluorescent Lamp Inverter Bart Milnes 338,689 60 *
Adjustable Strobe Light 319,477 36
Black Light 293,873 29
Colour (Sound) Organ 301,307 36
Electronic Dice NEW! 198,129 10 *
Fantastic Atom Expander 210,607 25
Flash Slave Trigger 230,482 18 *
Infa-Red Remote Control 649,064 216 *
IR Remote Extender NEW! 141,554 3 *
IR Remote Jammer Carl 276,370 110 *
IR Remote Switch NEW! 165,960 9 *
LASER Transmitter/Receiver 428,409 92
LED Chaser 457,783 83 *
LED Metronome NEW! 107,744 3 *
LED Thermometer 214,817 22 *
Light/Dark Detector 314,218 90 *
Simple Colour Organ 145,201 11 *
Strobe Light 284,101 27 *
TRIAC Light Dimmer 564,370 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,446 122 *
Electromagnetic Levitator NEW! 152,512 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,574 214 *
AC Motor Speed Controller 405,227 29 *
Air Flow Detector 260,328 54 *
Digital Keypad Combination Lock 210,182 20
Low Voltage Alarm 238,160 58 *
Pine Racecar Victory Judge 110,063 1 *
Pulse Width Modulation DC Motor Control 666,641 94
Rain Detector 314,057 112 *
Simple Lie Detector 576,035 323
Simple Polarity Tester Dudley LeRoux 174,118 13 *
Simple Servo Controller 230,892 22 *
Simple Touch Switch NEW! 178,994 6 *
Simple Two Speed Contactor DC Motor Controller 214,391 21 *
Stepper Motor Controller 765,012 120 *
Time Delay Relay 566,322 88
Time Delay Relay II jawaharlal@excite.com 256,671 39 *
Touch Switch 299,287 51 *
Video Activated Relay 129,695 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,124 10 *
Water Detector With Sump/Bilge Pump Controller 161,364 18 *
Wire Loop Alarm Alex Meaden 213,837 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,153 25 *
12VDC To 120VAC Inverter 1,557,213 691
6V to 12V Converter 540,181 121
Automatic 12V Lead Acid Battery Charger 950,235 248
Automatic Load Sensing Power Switch 176,433 16 *
Car Battery Charger 895,446 159 *
Dual Polarity Power Supply 382,261 84 *
Fixed Voltage Power Supply 321,049 52 *
High Current Power Supply 352,232 66 *
High Voltage High Current Power Supply 273,804 35 *
LASER Power Supply 306,565 28
Portable CD Player Adapter For Car 221,053 12 *
Power Supply 750,874 259 *
Solid State Tesla Coil NEW! 157,442 4
Solid State Tesla Coil/High Voltage Generator 457,931 51
Transformerless Power Supply 473,875 117 *
Voltage Inverter 354,082 51 *
Voltage Inverter II 213,022 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,873 182
3 Watt FM Transmitter Rae XL Tkacik 349,534 83 *
50 Watt Amplifier 520,277 74
8 Note Tune Player 148,963 12 *
8 Watt Audio Amp 386,439 67 *
Aircraft Radio Communications Receiver 291,104 50 *
Crystal Radio 170,040 53 *
Digital Volume Control 349,848 47 *
Electronic Stethoscope 332,907 142 *
FET Audio Mixer 354,006 41
FM Transmitter 1,029,222 420
Guitar Fuzz Effect 259,076 54 *
Microphone Mixer Anatoly I. Shikhatov 260,442 26 *
Mono To Stereo Synthesizer oRbEq 144,095 18 *
One Tube Regenerative Radio NEW! 160,500 4 *
Op Amp Radio 402,393 80 *
Single Chip AM Radio NEW! 108,752 4 *
Single Chip FM Radio NEW! 183,779 1 *
Sound Level Meter 352,355 51 *
Stereo Tube Amplifier Weslee Kinsler 278,887 15 *
Tone Control 320,572 31
Transistor Organ 210,090 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,365 27 *
FM Telephone Bug 242,782 57
Phone Busy Indicator 222,103 24 *
Remote Telephone Ringer 125,685 3 *
Ringing Phone Light Flasher 229,066 35 *
Simple Phone Tap Derek Tombrello 392,169 98 *
Telephone Hold Button 136,836 10
Telephone Recorder 224,730 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.