Darlington Oscillator (CB21142E)

Indicated by Popular Electronics, in an edition of the 90's, this circuit seems doubtful because of the inductance used, which must be large.

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Low Drift Sampling and Hold (CB5954E)
This low drift or offset circuit is from an 80's documentation. The configuration can be made with...
Magnetic Head Preamplifier (CB18898E)
This is a commercial circuit from a Japanese publication from 1972. The circuit uses a FET that...
Instrumentation Amplifier (CB12173E)
This instrumentation amplifier was obtained from Popular Electronics in 1993. The operational...