Null Indicator (CB23557E)

This circuit uses a transistor module, a version that preceded the integrated circuit. The circuit is from a Radio Electronics from May 1958.

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Galvanometer amplifier (CB21651E)
Obtained from a 1967 documentation, this circuit uses transistors from the time. The galvanometer can be a...
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Motors up to 2 A can be controlled by this circuit, which requires a symmetrical source. Although...
Six Transistor Superheterodyne Receiver (CB964E)
This sensitive MW receiver was found in a publication of year 1958., The circuit uses germanium...