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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RIAA Equalizing Preamplifier (CB4947E)
Indicated for vinyl media recovery, this circuit is from the 80's, having been found in an...
Common Telephones Intercom (CB17264E)
This circuit aims to take advantage of two old telephone sets in an efficient domestic intercom...
Incandescent flasher (CB12989E)
This circuit can be used for signaling a panel with a common incandescent lamp. The lamp will...