| 摘要 |
PURPOSE:To apply the maximum sensitivity without changing mue characteristic while inductance is changed by rotating one of two coils wound on a ferrite core in opposite direction so as to decrease the number of winding at the middle part. CONSTITUTION:A coil 6 is wound from the tip to the center at one side of the ferrite core 1 and fixed by an adhesives 7, a coil 8 is wound to the center continuously by 0.5-2 turns, a bobbinless coil 9 is wound again continuously to the other side, a lead 10 being the end of turn is led out by passing through the ferrite core 1 in the lengthwise direction and fited to a printed board 11. In adjusting the inductance, the bobbinless coil 9 is turned back by 0-4 turns in opposite direction to the coil winding direction and the inductance is changed by decreasing the number of winding of the coil 8 into zero and winding in opposite direction with further decrease. |
