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 1974 circuit uses two 555 integrated circuits in a very traditional configuration. The...
This circuit was found in Electronics Now magazine and can be applied to any JFET. The circuit has high...
The receiver shown above was sent in by contributing reader Adriano Muniz Moura and is used for...