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.
With this preamplifier it is possible to use a small speaker as a microphone. The circuit is also...
This is another one of the many debouncer circuits that the reader can find on this site, and it...
We found this circuit in an American documentation from the 90's. The circuit can be assembled with a...