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.
This well-known configuration, used in many car radios, is from the Philips Data Book of 1990. The...
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the...