Voice activated switch (CB8434E)

This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be used as a shield.

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Operational with variable gain (CB7408E)
This operational amplifier circuit with variable gain was obtained in an 80's Electronic...
Bistable with MOSFET (CB6813E)
The circuit shown was obtained in American documentation from 1968. MOSFETs can be replaced by...
Remote control extender (CB7026E)
We found this circuit in a Popular Electronics from the 80s. This circuit eventually doesn't work with...