Found in American documentation from the 90s, this circuit keeps the high beam on for a time determined by the trimpot adjustment. The relay is sensitive 12 V.
The operational amplifier can be of any type in this circuit, found in a 1974 publication. The...
This circuit was found in a 1969’s American documentation. It shows how to use two transistors to form...
This circuit serves as a reference for the components used and the time. The circuit is from 1967...