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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LM390 1W Amplifier (CB25306E)
This small audio amplifier is based on the LM390 with a minimum of external components. We found it...
12 W Amplifier with Bass Boost TDA 1910 (CB15231E)
The integrated circuit used is not common today. The circuit presents a bass boost according to...
Phase Inverter (CB7500E)
This circuit provides two outputs of the same signal. One with the original phase and the other...