| 摘要 |
An apparatus and method for degaussing a cathode ray tube including an alternating current (AC) source; a positive temperature coefficient (PTC) element; a resistance; a first switch coupled between said AC source and said PTC element in turn coupled to the resistance switching between a first position and a second position; a second switch coupled between the AC source and the PTC element switching between a first position and a second position; wherein in 110 volt operation, the first switch switched in a first position and the second switch switched in a second position; and conversely in 220 volt operation, the first switch switched in a second position and the second switch switched in a first position. Further, a first resistance is connected in series with a second resistance wherein both the first and second resistence being approximately the same ohmic values wherein the resistance balancing current flow in the 110 volt operation and the 220 volt operation so as the current flow across the PTC element in both modes of operation being substantially equal.. including a source of alternating voltage potential; a first and second switch means coupled to said source; a single positive temperature coefficient PTC thermistor device coupled to said first and second switch means; and a degaussing coil coupled to the PTC thermistor device wherein a degaussing current flowing through said PTC thermistor device equal to the current flow through the degaussing coil.
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