This optical counter was found in a 1964 Electronics Design. It makes use of an uncommon optocoupler today, using emission lamp and a phototransistor.
This circuit appears in this section in configurations that use other op amps. This is from 1999...
This bench circuit was found in the February 1998 issue of Electronics Now magazine. It can be...
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single-step motor...