Telephone disconnection detection circuit diagram

Published:2011/7/24 21:45:00 Author:Ecco | Keyword: Telephone disconnection detection, MOSFET | From:SeekIC

The chart shows the telephone disconnection detection circuit, which is based on the offset micro power consumption oscillator provided by telephone lines, and it generates differential signals, which is added to the circuit by the high voltage capacitor. These capacitors can provide the necessary isolation, and only when the output load of the oscillator itself is negligible, the detection circuit can detect oscillation. Oscillator uses the astable multivibrator composed of VT1 and VT2. This oscillator depends on the transistor collector resistance.



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