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 simple demonstration circuit was found in a Popular Electronics of the 1980s. It can be...
This circuit converts a resistance in the range between 1 k ohm and 1 MΩ to a signal in a...
The signal itself captured by the (long) antenna serves to feed this simple experimental circuit....