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.
LEDIL provides through Mouser Electronics a series of lenses for use in greenhouse horticulture....
This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a...
Using a symmetrical source this circuit reverses the rotation of a small motor through light...