Differential microammeter (CB7362E)

This circuit was obtained in a 1964 Electronic Design. The transistors are from the era and the instrument is 100 uA full-scale.

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Precision Switch Oscillator (CB4171E)
This circuit makes use of a PLL 567 and the components must be calculated according to the desired...
Receiver for remote control via powergrid (CB9577E)
The transmitter can be that of CB9574E. This receiver uses a PLL to directly trigger a sensitive relay....
Negative Feedback Stage (CB6131E)
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...