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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1000 second timer (CB23601E)
The existence of field effect transistors at the input of the integrated circuit (operational...
Siren Sound (CB23943E)
This circuit generates a siren sound. It was found in the April 1969 Radio Electronics magazine. The...
Selectable gain amplifier (CB7127E)
Suggested by Siliconix in documentation from the 90s, this circuit can present gains of digitally...