PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit was found in the magazine of radio amateurs 73, in an edition of the 90s.
Found in a Popular Electronics from the 90s, this circuit makes use of an unusual integrated...
Found in a 1969 documentation, this neon lamp circuit may have the number of steps increased. The power...
Found in American documentation, this circuit can make use of modern equivalent transistors. The...