The purpose of this circuit is to cut off the high voltage when the bias voltage fails. The circuit is from a 1975 documentation and can be adapted for other purposes.
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
This circuit is from an American documentation from the 50's. The transistor is the CK721, and the...
The figure shows how to use an operational circuit as a voltage divider. The circuit is from a...