This 1000: 1 voltage-controlled filter circuit was found in an Electronics Today International in a 1980s edition. The circuit is based on components of the time.
This circuit may be of interest to restorers of old video equipment. We found it in the Radio...
This circuit was found in a Popular Electronics from the 90s. The frequency range generated...
This circuit shows how to add a 1st regulator to a source that already has a step for this...