4049 Oscillator with Mark and Space (CB24857E)

With mark and space adjustment this circuit was found in November 1984 Radio Electronics. The base frequency depends on C1.

Sine to Square Converter (CB6586E)
Found in American documentation this circuit uses transistors of the time. The circuit can be made...
Electronic flasher (CB23766E)
This flasher with two power transistors was found in a Radio Electronics magazine from September 1961....
High speed FET switch (CB6928E)
Found in American documentation from 1969, this circuit switches signals with a FET of the time....