Locked relay shield (CB8837E)

This interesting configuration was found in a 1965s Electronic Design. It makes use of components of the time.

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Instrumentation Amplifier (CB15798E)
This amplifier with very high input resistance has variable gain and must be powered by a...
RF detector with triode (CB20898E)
Found in an Electronics Now from the 1980s, this circuit is based on grid leakage current for...
1 kHz PUT Oscillator (CB8039E)
Found in 1967 General Electric documentation this circuit uses a PUT and a diac to generate 1 kHz...