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.
The integrated circuit used in this application is not currently common. However, it can be...
This circuit can be used with any auio amplifier, converting it into a AM receiver. Antenna is a...
Found in a February 1970 Radio Electronics magazine article describing applications for the...