| 摘要 |
PURPOSE:To improve magnetic erasure effect with simple circuit constitution when performing the magnetic erasure by charging capacitors with a power voltage, by obtaining a voltage more than once the power voltage by connecting the charged capacitors in series by turning a switch. CONSTITUTION:Between the positive and negative poles of DC power source E1, resistance R1 and capacitor C are connected and in parallel to this capcitor C1, the series circuit of polarity inverting switch S2 and magnetic erasing coil L1 is connected. This switch S2 is provided with movable terminal S20 and two couples of fixed terminals a1-b2 and capacitor C2 is connected between a couple of terminals b1 and b2. Then, capacitors C1 and C2 are charged with power source E1 without reference to the change-over position of switch S2 and when coil L1 is magnetically erased, switch S2 is changed over to sides of terminals a1 and a2 to connect capacitors C1 and C2, charged with power source E1, in series. Then, coil L1 is magnetically erased with a voltage more than once power source E1, so that the effect of magnetic erasure will be improved with the simple circuit constitution. |
