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, April 27, 2025		 Remote Telephone Ringer8
Telephone Hold Button7
Yesterday
Saturday, April 26, 2025		 12VDC To 120VAC Inverter68
FM Transmitter49
Of All Time 12VDC To 120VAC Inverter1,545,764
FM Transmitter1,019,993

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 230,825 61 *
Car Alarm Arming Horn Beep Canceller bob 140,068 6 *
Wireless Auto Tachometer 347,573 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 163,434 29 *
Parallel (Printer) Port Interface 292,228 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 453,116 63 *
3 Channel Spectrum Analyzer 227,255 20
40W Fluorescent Lamp Inverter Bart Milnes 334,343 60 *
Adjustable Strobe Light 314,281 36
Black Light 287,749 29
Colour (Sound) Organ 295,978 36
Electronic Dice NEW! 193,454 10 *
Fantastic Atom Expander 206,720 25
Flash Slave Trigger 225,913 18 *
Infa-Red Remote Control 642,801 216 *
IR Remote Extender NEW! 137,175 3 *
IR Remote Jammer Carl 271,504 110 *
IR Remote Switch NEW! 161,471 9 *
LASER Transmitter/Receiver 422,980 92
LED Chaser 452,049 83 *
LED Metronome NEW! 103,492 3 *
LED Thermometer 210,889 22 *
Light/Dark Detector 310,102 90 *
Simple Colour Organ 141,113 11 *
Strobe Light 279,985 27 *
TRIAC Light Dimmer 559,169 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 365,458 122 *
Electromagnetic Levitator NEW! 148,453 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 929,656 214 *
AC Motor Speed Controller 398,784 29 *
Air Flow Detector 256,164 54 *
Digital Keypad Combination Lock 206,099 20
Low Voltage Alarm 233,583 58 *
Pine Racecar Victory Judge 106,326 1 *
Pulse Width Modulation DC Motor Control 661,031 94
Rain Detector 309,555 112 *
Simple Lie Detector 570,521 323
Simple Polarity Tester Dudley LeRoux 169,633 13 *
Simple Servo Controller 226,215 22 *
Simple Touch Switch NEW! 174,363 6 *
Simple Two Speed Contactor DC Motor Controller 209,721 21 *
Stepper Motor Controller 756,783 120 *
Time Delay Relay 561,291 88
Time Delay Relay II jawaharlal@excite.com 252,091 39 *
Touch Switch 294,635 51 *
Video Activated Relay 125,733 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 186,233 10 *
Water Detector With Sump/Bilge Pump Controller 157,270 18 *
Wire Loop Alarm Alex Meaden 209,777 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 323,825 25 *
12VDC To 120VAC Inverter 1,545,764 691
6V to 12V Converter 534,508 121
Automatic 12V Lead Acid Battery Charger 944,300 248
Automatic Load Sensing Power Switch 172,026 16 *
Car Battery Charger 889,643 159 *
Dual Polarity Power Supply 376,705 84 *
Fixed Voltage Power Supply 316,592 52 *
High Current Power Supply 346,347 66 *
High Voltage High Current Power Supply 269,061 35 *
LASER Power Supply 301,883 28
Portable CD Player Adapter For Car 216,707 12 *
Power Supply 745,661 259 *
Solid State Tesla Coil NEW! 152,011 4
Solid State Tesla Coil/High Voltage Generator 451,625 51
Transformerless Power Supply 468,834 117 *
Voltage Inverter 347,293 51 *
Voltage Inverter II 208,555 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 591,016 182
3 Watt FM Transmitter Rae XL Tkacik 342,958 83 *
50 Watt Amplifier 514,588 74
8 Note Tune Player 144,975 12 *
8 Watt Audio Amp 380,186 67 *
Aircraft Radio Communications Receiver 285,558 50 *
Crystal Radio 164,396 53 *
Digital Volume Control 344,267 47 *
Electronic Stethoscope 327,653 142 *
FET Audio Mixer 349,276 41
FM Transmitter 1,019,993 420
Guitar Fuzz Effect 253,479 54 *
Microphone Mixer Anatoly I. Shikhatov 255,840 26 *
Mono To Stereo Synthesizer oRbEq 139,314 18 *
One Tube Regenerative Radio NEW! 152,621 4 *
Op Amp Radio 396,623 80 *
Single Chip AM Radio NEW! 104,500 4 *
Single Chip FM Radio NEW! 178,458 1 *
Sound Level Meter 347,444 51 *
Stereo Tube Amplifier Weslee Kinsler 273,712 15 *
Tone Control 315,360 31
Transistor Organ 205,371 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 167,551 27 *
FM Telephone Bug 239,141 57
Phone Busy Indicator 218,118 24 *
Remote Telephone Ringer 122,015 3 *
Ringing Phone Light Flasher 224,018 35 *
Simple Phone Tap Derek Tombrello 388,101 98 *
Telephone Hold Button 133,095 10
Telephone Recorder 220,962 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.