Touch switch (CB9375E)

This biestable circuit was found in a Popular Electronics from the 90s. The circuit has an unusual configuration today, using components of the time.

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MC1454G Amplifier (CB24236E)
The integrated circuit is from the time. This low-power circuit was found in the April 1973 issue...
Class B Low Power Amplifier (CB19069E)
This small amplifier, close to 1 W, was found in a 1963 documentation. The class B circuit uses...
20 mA Current Source (CB13423E)
This source of constant current was obtained in an American documentation of 1973. The transistors can be...