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 obtained from a Linear Technology manual from the 1990s. The sensor is of the...
This circuit for VCR recording heads was found in the February 1990 issue of Radio Electronics magazine....
The integrated circuit used in this project is not common today. It was found in a 2000...