Switching assembly for monitoring a tachometer for a drive motor of a drum of a washing machine

摘要

The arrangement (1) has a micro processor (6) and a triac (7) connected with a tachometer-evaluation circuit (8), where the triac is electrically connected with a drive motor (5) and rotational speed of the drive motor is controllable by the triac. The tachometer-evaluation circuit includes an electronic transistor with a control electrode, which is pre-stressed. The pre-stressing of the control electrode is adjusted such that less electrical voltage is sufficient to move the control electrode in conductive state.