Found in an American documentation from 1969, this astounding circuitry makes a relay operate on 3 Hz cycles. The relay is of the high voltage type of the time.
Based on a unijunction transistor, this circuit was found in the January 1994 issue of Electronics Now...
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
This variable duty cycle circuit was found in the December 1993 issue of Electronics Now magazine. The...