Audio Controlled Switch (CB21262E)

This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of any type determining the controlled load.

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50 W Amplifier (CB6180E)
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....
Temperature Controller (CB6017E)
This circuit is from a factory documentation (National Semiconductor) of the 80's. The power...
4.5 W Amplifier (CB6298E)
This 1968 Mallory circuit uses an uncommon integrated circuit today. The circuit has a 30 to...