This circuit for car engine spot adjustment was found in an 80's Radio Electronics. The circuit makes use of a xenon lamp and the pulse transformer must have a turn ratio of 1:50.
This traditional 555 touch bistable configuration has already been explored in projects on this...
In the figure we have a circuit that allows us to obtain a variable voltage of approximately 0.5 to 25 V...
This circuit was obtained in an old publication of 1978. The integrated circuit is the critical...