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 obtained in a 1975 documentation. The maximum frequency depends on the diodes and the...
This circuit was found in an American documentation from 1976. We can assemble it with two 741,...
Found in Intersil documentation from the 90s, this thermometer uses an analog indicator. The...