This circuit with zener diodes was found in documentation from the 90s. The zener diodes determine the lighting point of the LEDs. The circuit is for 12 V automotive batteries.
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
This CMOS circuit was found in a Popular Electronics from the 80's. The circuit consists of a...
This circuit was found in an American documentation from 1969. The circuit is a multi-indicator with...