3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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Bistable Using Relay and SCR (CB541E)
This set-rest relay uses two SCR and two switches to control a DC relay. The circuit can be used...
Simple power supply (CB22216E)
This simple power supply for transistors was found in documentation from the 1940s. The...
Dielectric Absorption Meter (CB21586E)
The purpose of this circuit is to measure the absorption current of a capacitor. Dielectric...