| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter circuit for which the mounting space of a choke coil is saved and which is not influenced by external noise. SOLUTION: Aπtype filter circuit comprises: an input side electrolytic capacitor 12; a first winding wire 16 wound around the input side electrolytic capacitor 12; an output side electrolytic capacitor 14; a second winding wire 18 wound around the output side electrolytic capacitor 14; and a positive pattern composed of an input side positive pattern 20 and an output side positive pattern 22 separately formed on a substrate, and a negative pattern is formed on the substrate 10. The positive terminal of the input side electrolytic capacitor 12 and one end of the first winding wire 16 are connected to the input side positive pattern, the positive terminal of the output side electrolytic capacitor 14 and one end of the second winding wire 18 are connected to the output side positive pattern 22, the respective other ends of the first winding wire 16 and the second winding wire 18 are connected to a land pattern 28, and the negative terminals of the input side electrolytic capacitor 12 and the output side electrolytic capacitor 14 are connected to the negative pattern. COPYRIGHT: (C)2006,JPO&NCIPI
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