This circuit was found in a 1964 Electronic Design. The components are of the time, and modern equivalents can be used. Note the multi-emitter transistor.
This circuit was found in a National Semiconductor manual from the 1970s, appearing in articles and on...
Found in 1965s General Electric documentation, this circuit is intended for the control of servos...
We found in this American documentation this circuit for activating common cathode displays. In it we...