| 摘要 |
PURPOSE:To improve the electrostatic strength without losing noise immunity to ground by connecting electrically a metallic frame of a switch and a DC power line for control circuit. CONSTITUTION:A stabilized power supply having a required prescribed potential for the control circuit 8 is formed by a stabilized power supply 7 of a remote controller. The circuit 8 receives an input signal of the 1st and 2nd switches 9, 10 and is operated. Further, spike noise due to static discharge applied to the switches 9, 10 is absorbed by a bypass capacitor 13 at the primary side of the power supply device 7 through the 1st and 2nd short-circuit wires 11, 12. This absorption prevents spike noise due to a switch contact from being applied to the input side of the circuit 8. Thus, the electrostatic strength is improved without losing noise immunity to ground. |
