Transistorized Voltmeter (CB21664E)

This simple voltmeter was found in Popular Electronics from May 1968. The circuit makes use of a germanium transistor from the time.

Vswr protection circuit (CB20375E)
This protection circuit for standing waves was found in a manual of high frequency circuits and...
High impedance stage (CB20564E)
This high input impedance amplifier stage was found in a 1963 documentation. The transistor...
Photodiode Amplifier (CB4846E)
This setting appears multiple times on the site from different sources. This is from a 2000 manual...