This circuit is from the time when cars used contact breakers. This 80's version measures the dwell angle of the contact breaker for dwell adjustment using an era integrated circuit, the LM3917.
The purpose of this circuit is to enable testing of transistors using a common multimeter. With the...
Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine....
The circuit shown in the figure is recommended for applications where a visual indication is...