This circuit was found in Philips documentation from 1967. The components are of the time, being transistors like BCY38 for TR1, BC108 for TR3, and others depending on currents.
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...