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
Wednesday, September 09, 2026		 One Tube Regenerative Radio22
12VDC To 120VAC Inverter19
Yesterday
Tuesday, September 08, 2026		 7 Segment LED Counter167
LED Chaser91
Of All Time 12VDC To 120VAC Inverter1,568,913
FM Transmitter1,038,208

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,724 61 *
Car Alarm Arming Horn Beep Canceller bob 147,246 6 *
Wireless Auto Tachometer 356,450 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,305 29 *
Parallel (Printer) Port Interface 303,055 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,092 63 *
3 Channel Spectrum Analyzer 236,846 20
40W Fluorescent Lamp Inverter Bart Milnes 342,751 60 *
Adjustable Strobe Light 323,999 36
Black Light 299,220 29
Colour (Sound) Organ 306,352 36
Electronic Dice NEW! 202,418 10 *
Fantastic Atom Expander 214,328 25
Flash Slave Trigger 235,058 18 *
Infa-Red Remote Control 654,472 216 *
IR Remote Extender NEW! 145,756 3 *
IR Remote Jammer Carl 281,142 110 *
IR Remote Switch NEW! 169,929 9 *
LASER Transmitter/Receiver 433,259 92
LED Chaser 463,314 83 *
LED Metronome NEW! 111,864 3 *
LED Thermometer 218,445 22 *
Light/Dark Detector 317,989 90 *
Simple Colour Organ 148,897 11 *
Strobe Light 287,999 27 *
TRIAC Light Dimmer 570,230 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,959 122 *
Electromagnetic Levitator NEW! 156,260 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,589 214 *
AC Motor Speed Controller 410,631 29 *
Air Flow Detector 264,557 54 *
Digital Keypad Combination Lock 213,984 20
Low Voltage Alarm 242,375 58 *
Pine Racecar Victory Judge 113,610 1 *
Pulse Width Modulation DC Motor Control 671,803 94
Rain Detector 318,407 112 *
Simple Lie Detector 580,792 323
Simple Polarity Tester Dudley LeRoux 178,318 13 *
Simple Servo Controller 235,262 22 *
Simple Touch Switch NEW! 183,344 6 *
Simple Two Speed Contactor DC Motor Controller 218,737 21 *
Stepper Motor Controller 771,830 120 *
Time Delay Relay 571,240 88
Time Delay Relay II jawaharlal@excite.com 260,821 39 *
Touch Switch 303,644 51 *
Video Activated Relay 133,300 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,787 10 *
Water Detector With Sump/Bilge Pump Controller 165,506 18 *
Wire Loop Alarm Alex Meaden 217,684 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,061 25 *
12VDC To 120VAC Inverter 1,568,913 691
6V to 12V Converter 545,895 121
Automatic 12V Lead Acid Battery Charger 956,840 248
Automatic Load Sensing Power Switch 180,637 16 *
Car Battery Charger 900,622 159 *
Dual Polarity Power Supply 387,123 84 *
Fixed Voltage Power Supply 324,705 52 *
High Current Power Supply 357,140 66 *
High Voltage High Current Power Supply 277,965 35 *
LASER Power Supply 310,871 28
Portable CD Player Adapter For Car 225,132 12 *
Power Supply 756,068 259 *
Solid State Tesla Coil NEW! 162,658 4
Solid State Tesla Coil/High Voltage Generator 464,598 51
Transformerless Power Supply 478,123 117 *
Voltage Inverter 359,644 51 *
Voltage Inverter II 217,101 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,068 182
3 Watt FM Transmitter Rae XL Tkacik 355,069 83 *
50 Watt Amplifier 524,911 74
8 Note Tune Player 152,543 12 *
8 Watt Audio Amp 392,041 67 *
Aircraft Radio Communications Receiver 296,217 50 *
Crystal Radio 175,335 53 *
Digital Volume Control 354,312 47 *
Electronic Stethoscope 338,112 142 *
FET Audio Mixer 358,188 41
FM Transmitter 1,038,208 420
Guitar Fuzz Effect 264,158 54 *
Microphone Mixer Anatoly I. Shikhatov 264,521 26 *
Mono To Stereo Synthesizer oRbEq 148,395 18 *
One Tube Regenerative Radio NEW! 166,585 4 *
Op Amp Radio 407,390 80 *
Single Chip AM Radio NEW! 112,936 4 *
Single Chip FM Radio NEW! 188,843 1 *
Sound Level Meter 356,758 51 *
Stereo Tube Amplifier Weslee Kinsler 283,409 15 *
Tone Control 325,216 31
Transistor Organ 214,536 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,812 27 *
FM Telephone Bug 246,357 57
Phone Busy Indicator 225,991 24 *
Remote Telephone Ringer 129,256 3 *
Ringing Phone Light Flasher 234,045 35 *
Simple Phone Tap Derek Tombrello 395,942 98 *
Telephone Hold Button 140,206 10
Telephone Recorder 228,374 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.