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Telephone | Electronic circuits

    
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Electronic circuits archive 

Electronic circuits -> Telephone


Telephone line audio interfacing circuits
Telephone Line Monitor
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)
Telephone Line Monitor
Telephone Line Monitor (Plans)
Telephone Line Monitor
Telephone line simulator
Telephone Line Vigilant
Telephone music on hold box
Telephone Number Display
TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook.
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."
Telephone privacy adapter
Telephone privacy adapter
Telephone privacy adapter
Telephone Recorder
Telephone Recorder
Telephone recording circuit
Telephone recording circuit
Telephone ring controlled relay

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