2-LINE INTERCOMCUM- TELEPHONE LINE CHANGEOVER CIRCUIT
The circuit presented here can be
used for connecting two telephones in parallel and also as a 2-line intercom.
Usually a single telephone is connected to a telephone line. If another
telephone is required at some distance, a parallel line is taken for connecting
the other telephone. In this simple parallel line operation, the main problem
is loss of privacy besides interference from the other phone. This problem is
obviated in the circuit presented here. Under normal condition, two telephones
(telephone 1 and 2) can be used as intercom while telephone 3 is connected to
the lines from exchange.
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