The purpose of this circuit is to monitor the output voltage of a power supply. The under and over voltage indicator was found in the August 1991 Radio Electronics magazine.
This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and...
This circuit was taken from the 1976 Siemens Integrated Circuits Manual. The TCA106 is an...
The presented circuit monitors a line indicating if it is busy if there is an extension. The...