Dynamic compressor (CB21762E)

This circuit was found in a 1977 publication for radio amateurs. Transistors are common general-purpose types of the time.

Vibrato For Guitar (CB12854E)
This circuit uses old germanium transistors because it was found in an old magazine from 1973....
Pulse Logic Test (CB4721E)
This logic level indicator also indicates the presence of pulsating signals through a third LED. It...
Sample and Hold with the (CB3998E)
This circuit is from the 1990 Motorola Linear Databook, which can be developed with more modern...