This old voice circuit suitable for telephones of the time was found in a Radio Electronics from September 1973. The circuit is powered by a voltage of 7 V.
This low power, low voltage circuit was found in old General Electric documentation. Transistors may...
With this circuit it is possible to make the selection of transistors and their test according to the...
This radio with selector switch tuning was found in a Popular Electronics from May 1956. Listening is...