VR-BOX AUTO-CONTROL CIRCUIT OF SOFT-TOUCHING TV

摘要

The circuit automatically controls the variable resistors of the TV set. An analogue/digital converter converts the resistance values of the variable resistors of a VR-BOX (1) to digital values, and another analogue/digital converter converts the resistance values of a VR-BOX (2) to digital values. A comparator compares the two digital values of the two analogue/digital converters in order to output difference signals and synchronizing signals. A motor controller supplies the output of an AND gate to a motor driver upon receipt of the output of the AND gate which logic- multiplies separated signals. A normal and reverse control section supplies normal and reverse revolution signals to the motor driver, and a step motor shifts the unadjusted variable resistances of the VR-BOX (2).