摘要： 通过解释法拉第定律启动此应用程序说明。注释然后显示如何电压表和连接导线作为一个位置传感器。一轨到轨 I/O 比较器和几个简单组件构成比较直流电压正弦波振幅的振幅探测器。MAX985 轨到轨 I/O 运算放大器的特点是在设计中。Maxim > App Notes > General engineering topics Measurement circuits Miscellaneous circuits Keywords: Faraday's Law, voltmeter, position sensor, amplitude detector, sinewave amplitude Sep 22, 2003 APPLICATION NOTE 2238 Position sensor exploits Faraday's Law Abstract: This application note starts by explaining Faraday's Law. The note then shows how a voltmeter and connecting wires serve as a positional sensor. A rail-to-rail I/O comparator and a few simple components form an amplitude detector that compares the sinewave amplitude with a DC voltage. The MAX985 rail-to-rail I/O op amp is featured in the design. Consider two resistors R1 (1kΩ) and R2 (3kΩ), connected in parallel as shown in Figure 1. A time-varying magnetic field H, increasing linearly with time,……