| 摘要 |
PURPOSE:To prevent the production of an output signal with the wrong input signal, by connecting in series a voltage divided resistances connected in series and a capacitor and grounding the point of connection between the said resistances with the input signal. CONSTITUTION:A capacitor 4 is charged through resistances 1, 2 and 3 simultaneously with the start of electric conduction. In this case, the potential of point (a) of connection is higher than that of point (b) of connection. Thus no output is delivered from an operational amplifier 5. When an input signal is applied with a switch 6 turned on, the potential of the point (a) becomes lower than that of the point (b). Thus the capacitor 4 is discharged. And the output is delivered continuously from the amplifier 5 until the potential of the capacitor 4 becomes lower than that of the point (a). |
