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 good gain antenna up to 30 MHz was found in an American 1990s documentation. The circuit can be...
This circuit keeps an LED on briefly when S1 is pressed. The time depends on C1. The circuit is...
This circuit was found in the September 1992 issue of Radio Electronics magazine. The circuit does...