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 circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...