This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...
This circuit is connected to the sum key of a common calculator. Adjusted to produce a pulse per...
Using Linear Technology's LTC4252-1, this circuit was found in a 2005 manual. The circuit makes use of...