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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10 Hz to 10 kHz Voltage controlled oscillator (CB20600E)
This circuit was found in documentation from the 80s. The components are from the time, but the...
Oscillator with Relay (CB19779E)
We can make an oscillating relay producing a rectangular signal taking advantage of the inductance of...
Voltage Follower (CB16230E)
The circuit shown in the figure is a voltage follower, that is, an amplifier with unit gain. The...