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.
Suggested by an American documentation for 1969 neon lamps, this circuit provides SCR control with...
This symmetrical source was obtained from Popular Electronics from February 1979. Transistor Q1...
The transistor may be any general purpose, but the integrated transistor is not common today....