No information is given on the transformer in this circuit that we found in an American 1967 documentation. The power transistors are of the time and mounted on a plug-in module.
With a touch of S1 this circuit keeps a small strand of nichrome warm enough to light a cigarette....
This circuit is from a 90s Popular Electronics. The integrated circuit is from that time. The...
This two-transistor delay circuit from the 1960s was found in documentation from the time....