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 shows how it is possible to control 9 loads with only 6 Triacs using the matrix...
This fraction of a watt power stage was published in Radio Electronics September 1950....
This MW bedside radio was found in an English documentation from 1989. It is based on a dedicated...