This circuit from a 1966 General Electric manual makes use of an SCS. The time is given by the emitter capacitors of the unijunction transistor.
This simple expandable circuit was obtained from a Popular Electronics from the 80's. The supply...
This circuit in the National Semiconductor Fast IC Power Transistor manual uses a special power...
This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is...