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 the 1967 RCA SCR manual. The circuit generates approximately 300 V at a...
Once turned on, this circuit causes an LED to remain lit for approximately 30 minutes. Larger...
The circuit shown was found in the National Semiconductor's Linear Applications Handbook of 1994....