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.
We find the original version of this circuit in an English publication (1986). It is a...
This FET stage circuit was obtained from old American documentation but can be applied to any FET....
This CMOS 4001 oscillator alternately turns the relay on and off at times set by R2. The circuit is...