This configuration similar to many of this site was found in 1965 General Electric documentation. Modern equivalent transistors can be used. LEDs can be used.
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...