Transistorized multimeter (CB7355E)

This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common FET and the general-purpose bipolar transistor.

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2-Transistor MW Radio (CB18309E)
This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and...
Darlington Power Switch NPN (CB991E)
This circuit can be used to drive relays, solenoids, motors and other loads according the...
Whistle Remote Control (CB4295E)
This circuit is based on the small keychain that responded to the sound of a whistle and were...