| 摘要 |
PURPOSE:To make a device strong against a locking phenomenon and prevent a trouble regardless of increased number of times of the noise, by connecting the base of a transistor, which constitutes a peak detector, to the connection point of a pair of series resistance connected between input and output terminals. CONSTITUTION:A series connection circuit of resistances 14 and 15 is connected between an input terminal (a) and an output terminal (b), and the base of a transistor TR 6 of a peak detector is connected to the connection point of resistances 14 and 15. Therefore, when a TR 5 is operated to operate a noise elimination circuit, a base potential VB3 of the TR 6 is higher than that for omission of the resistance 15 by R15/(R15+R14) (R14 and R15 are resistance values of resistances 14 and 15). This base potential VB3 is detected to determine the base potential of a TR 5, and this potential becomes high, and therefore, locking phenomena are difficult to occur. When the number of times of the noise is increased, the potential VB3 is lower than the potential of the terminal (a), and the TR 6 is operated by the noise to reduce the rise of the base potential of the TR 5, thus improving the operation of the noise elimination device. |
