Medium wave range booster (CB21677E)

This circuit is from a 1960 book by Hugo Gernsback. The transistors are germanium from the time.

Decade Counter Using the 4017 (CB172)
The basic configuration for a 4017 when used as a decade divider with one-of-ten decoded outputs...
Negative Voltage Generator (CB25844E)
This very low power circuit is based on the ICL7860. We found it in an Electronics Now from April...
Light Operated Relay (CB19968E)
This circuit is from an American manual from 1975. The transistors are types of the time, but...