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 frequency modulated light transmitter is from a 1990s documentation. The circuit may use...
This amplifier is from the 80s integrated circuit manual itself. Equivalent configurations can be adopted for...
Found in a 1968 Mullard manual, this circuit can function as an infrared audio link. The...