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 a 90s Popular Electronics. The circuit uses components from that time,...
This circuit simulates a diode whose characteristics can be adjusted with a trimpot. The circuit is...
This circuit is a modification of the previous one, also found in the July 1995 Electronics Now...