MOSFET Amplifier Stage (CB26315E)

Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the impedance of the speaker being driven.

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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...