Three-phase power supply (CB23680E)

This circuit was found in Radio Electronics magazine from July 1960. The components used are transistors of the time.

Lie detector (CB7005E)
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
One Transistor Alarm (CB914E)
This one-transistor alarm can be used with much more sensors than the two shown by the figure....
Frequency Doubler (CB13736E)
This circuit was obtained in a 1975 documentation. The maximum frequency depends on the diodes and the...