This static switch circuit or solid-state contactor was found in a Motorola documentation from 1968. The circuit can control a 5 A load with the indicated transistor.
This signal follower is from a 1970's documentation. So it uses the traditional configuration at the time...
This is the receiver for the previous circuit. The audio amplifier supports equivalents. The...
This circuit is from 1980 documentation but can still be assembled today with BC548 transistors. The...