| 摘要 |
PURPOSE:To reduce the effect of the temperature change and also to eliminate the use of a bias magnet by using a comparator which shows the hysteresis characteristics. CONSTITUTION:A magnetic sensor 1 is connected to a DC power supply E1, and the power is supplied to one side of an amplifier 2. The sensor 1 delivers the voltage value VH between +10V and -10V, for example, according to the magnetic polarity and its intensity. Therefore voltage V2 varies to 0V-20V. A DC power supply E2 is applied as the reference voltage to the other side of the amplifier 2 via a resistance R2 and also connected to an output terminal 3 via a resistance R3. The amplifier 2 can have the hysteresis characteristics when the power supply E2 and the values of resistances R2 and R3 are controlled properly. |
