| 摘要 |
One terminal of a switch 53 is connected to a resistor 51 having its other terminal connected to a rechargeable battery, and the other terminals connected through a resistor 54 to a capacitor 55. Another capacitor 52 is connected to the node between the switch 53 and the resistor 51. Initially, while the switch 53 is in the OFF state, the rechargeable battery charges the capacitor 52 towards the battery voltage through the resistor 51. When the switch 53 is turned ON, capacitor 55 and capacitor 52 become connected in parallel and the voltage across capacitor 55 rises within a short time period. When the switch 53 again turns OFF, voltage indication continues in compliance with the voltage across the capacitor 55 even as that voltage decays according to the time constant of the parallel circuit formed by the capacitor 55 and a series-connection of resistors 71, 72.
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