Speed control for audio or video mixing deck comprises magnet or optically coded component attached to shaft and magnetic or optical sensor, constant operating force being maintained by spring acting radially or axially on shaft

摘要

Speed control for an audio or video mixing deck comprises a magnet (9) or optically coded component attached to the shaft (7) and a magnetic or optical sensor. A constant operating force is maintained by a spring (4) which acts radially or axially on the shaft.