Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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10 Minute Timer (CB1501E )
The circuit shown in the figure was found in a 1974 publication. The field effect transistor may...
DC Motor Reversal with Transistors (2) (CB11602E)
I found this circuit in an English publication from 1989. This configuration can be mounted with...
Spy FM Transmitter with Varicap (CB14870E)
We found this circuit in a small espionage manual from 1993. The components are current, and the...