Simple Telephone Transmiter


Posted on Feb 6, 2014

This circuit is a circuit diagram of a simple transmitter, but very useful circuit which can be used to transmit telephone conversations. When the telephone receiver on the hook to the line voltage of about 48 volts. R7 preset is adjusted to 24.7 V between the cathode of D2 and ground. In voltage Zener diode D2 will be in the breakdown and the transistor T1 will conduct. This makes the transistor T2 OFF. When the receiver off the hook, the line voltage drops to about 11 volts. This makes the tra.


Simple Telephone Transmiter
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