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2242 CIRCUIT circuit

    
: Infrared control system



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LED Photo Sensor Circuit
Category: // C/IR
Source: Bowdens Hobby Circuits
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."
[ rar ] - WinRAR
Category:
Source: Art's Theremin Page
TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook.
[ rar ] - WinRAR
Category:
Source: Art's Theremin Page
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:
Source: Bubblegate
Telephone recording circuit
Category:
Source: CircuitoZ
Simple circuit to connect telephone equipment to audio mixer
Category:
Source: Tomi Engdahl's Electronics Pages
Caller ID Circuit
Category:
Source: Circuits Arhive- University of Washington
Telephone In-Use Relay Circuit
Category:
Source: Bowdens Hobby Circuits
DIGITAL NOISE GENERATOR. This circuit produces a repeating sequence of serial data that contains attributes useful for emulating audible noise.
[ rar ] - WinRAR
Category: /
Source: Art's Theremin Page
"In-Circuit" Electrolytic Tester (PIC)
Category: /
Source: PIC Programming Home page (Talking Electronics)
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