Phone Call Amplifier (CB21271E)

This circuit was found in an old Electronics Now. The transistors are general- purpose and the circuit is powered by an external source.

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Scale Adapter for Multimeter (CB16845E)
The purpose of this circuit is to allow common analog multimeters to measure low resistances, on...
Analog Multimeter N 201 (CB18869E)
This is the circuit of the N-201 commercial multimeter of the analog type. The circuit is from...
Single transistor receiver (CB22568E)
This receiver was found in the Radio Electronics magazine of March 1953. It tunes to the medium wave...