This two-transistor circuit was found in a 1966 US documentation. The power transistors are of the time. The system is intended for cars with contact breaker.
The circuit shown is from the 1994 Linear Applications Handbook from National Semiconductor. The...
The purpose of this circuit found in a Popular Electronics from 1972 is to intensify certain...
Two transistors on a regenerative switch are used to trigger a triac. This circuit is from the RCA...