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Electronic circuits archive 



Results 201 - 210 of about 218

Color Organ Light - Flashes coloured christmas type lightbulbs to music. This circuit works REALLY well. Notice how it will fire even in complete silence. This provides a sort of automatic gain control.
Category: Light/Laser/IR
Source: Interesting Schematics - Novotill
Windshield Wiper Delay (26k) Add a wiper delay circuit to your car for those drizzly days.
[ file in PDF format ] - download Acrobat Reader
Category: Auto
Source: Wenzel Associates
TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook.
[ file in RAR format ] - download WinRAR
Category: Telephone
Source: Art's Theremin Page
Tape Head Demagnetizer Cassettes - Demagnetizer cassettes contain a battery powerd circuit
Category: Audio
Source: Interesting Schematics - Novotill
PWM DC Motor Speed Control (This is a circuit for controlling the speed of small DC motors, it makes a great model railroad speed control.)
Category: RC Modeling
Source: FC's Electronic Circuits
220V mains monitor. With this circuit you will be able to monitor the quality of the mains. (simple)
Category: Domestic
Source: Bubblegate
220V mains monitor. With this circuit you will be able to monitor the quality of the mains. (simple)
Category: Power Suply
Source: Bubblegate
TELEPHONE OFF-HOOK TONE GENERATOR. This circuit generates the sound that many telephone companies use to attract the customer's attention to their phone when they leave it "off hook." It is also refered to, in telephony jargon, as "ROH," for "receiver off-hook."
[ file in RAR format ] - download WinRAR
Category: Telephone
Source: Art's Theremin Page
Sensitive geomagnetic detector. This is a rather sensitive circuit which will detect minute variations of a magnetic field, particularly the Earth magnetic field. (simple)
Category: Meters
Source: Bubblegate
Telephone line monitor. If you feel that somebody is tampering with your telephone line you might find this little circuit useful. It detects if there is another telephone connected to the line, if there is a short or an open line. (simple)
Category: Security
Source: Bubblegate
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