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.
The circuit is suitable for calls in a residence and was published in the Radio Electronics...
This 25 W phase photo control was found in a 1965 General Electric publication. The circuit uses a...
The integrated circuit in question is an adjustable high voltage regulator from Texas Instruments...