| 摘要 |
A power circuit was comprised or a AC/DC switch, a rectifier circuit(4) and an effective filter. A.C.is supplied to the effective filter through the rectifier circuit. The rectifier circuit and effective filter are disconnected by the switch in the D.C. position. The resistance producing the voltage different between the input and output of the effective filter, is divided at least into two in the circuit in which D.C. is directly supplied to the effective filter.
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