Found in an American documentation from 1969, this astounding circuitry makes a relay operate on 3 Hz cycles. The relay is of the high voltage type of the time.
Found in a General Electric documentation from 1970, this circuit consists of a relaxation...
This two-transistor output stage source currents up to 100 mA to a load using the 2N3906, but can...
We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary...