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 is from 1982 documentation and has some interesting uses, despite its extreme...
This battery circuit provides a charging current of 500 mA depending on the solar panel. The...
This circuit cuts the audio spikes. It was found in an English publication from the 1980s....