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.
This circuit was found in a 1992 publication. What it does is to light an external lamp when it...
When the sensor connected to points A and B is activated, removing the ground from the base of Q1...
This circuit can be used to produce the sound of bongo drums. Damping is adjusted by P1. The...