This two-transistor circuit was found in a 1966 US documentation. The power transistors are of the time. The system is intended for cars with contact breaker.
This circuit was found in documentation from the 90's. It is based on CMOS integrated circuits and can be...
This circuit is from an ancient American documentation. The integrated circuit is 741 and the...
This circuit was found in the June 1982 issue of Radio Electronics magazine. It provides reference...