This circuit makes use of a specific 80's component and was found in an American manual of the time. A matrix keyboard allows you to select one of several music programs.
This circuit was found in an old SCR manual. The types used are from the time, but the setting can...
Texas Instruments has downloadable documentation on designing digital isolators. The Digital...
January 2017 - Bourns' 100 mm motorized sliding pots can now be purchased from Mouser Electronics....