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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Shaver adapter (CB9953E)
This circuit allows 220 / 240V shavers to be used in the 110V network. The diodes can be general...
1 kHz Bandpass Filter (CB24388E)
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Darlington Conventional Optocoupler (CB13063E)
Here we have in the figure the configuration of the circuit as a conventional Darlington. In this...