Variable Phase Comparator (CB6493E)

This circuit was obtained from an American documentation from 1976. The circuit can be adapted to modern TTL components and used as a shield.

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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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Six Transistor Superheterodyne Receiver (CB964E)
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