This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
The purpose of this circuit is to cut off the high voltage when the bias voltage fails. The...
We found this circuit in a Radio Electronics from May 1966. The sensor is a photocell, and the...
This circuit was found in a 90s Electronics Now. It generates sinusoidal signals according to the...