30W Amplifier (T1544E)

This hi-fi amplifier is from a 1975 RCA tube manual. The critical components are the transformers. Power supply is included.

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...