Micropower amplifier (CB7461E)

This amplifier was found in an Electronics Now from the 90s. The FETs are part of a CD4007CB.

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Astable Neon (CB10504E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
Comparator with AND gate (CB9407E)
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
Stereo Simulator (CB11520E)
This circuit provides two slightly different audio signal outputs from a monophonic audio signal, so...