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 found in a 1986 documentation and it may be difficult to obtain some of its...
This circuit was found in an old publication about transistor. The original trasistors are...
This circuit is for traditional old-style telephone lines found in an American 1980s...