| 摘要 |
PURPOSE:To obtain a printed pattern variable inductor by a method wherein spiral patterns are formed on a double-sided printed circuit board or a multi- layer printed circuit board and a core is inserted in the center of the patterns. CONSTITUTION:A spiral pattern 2 is formed on the front surface of a double- sided printed circuit board 1 and a jumper wire 3 is connected. A spiral pattern 4 is formed on the back surface of the board 1 and a jumper wire 3a is connected. A core 6 is inserted in the center of the patterns 3, 4 and the core 6 is screwed into a sleeve 7, for instance, a vinyl tube, which has no effect against the flux. With this constitution, coupling and inductance can be varied. |
