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PA System Phone Pager Circuit

2016-02-16 00:47  
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An apparatus for interfacing a telephone system having a central processor and a plurality of telephone extension lines operatively connected to the central processor to at least one pager transmitter. For each pager transmitter there is an interface circuit which is connected to one of the telephone extension lines and to one of the pager transmitters.This pager allows you to use your in-house phone wiring as a PA system. It uses two tone decoders to detect a particular touch-tone key.This key enables ari audio amplifier.An audio power amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.Modest power audio amplifiers for driving small speakers or other light loads can be constructed in a number of ways.

Phone Pager Circuit