我想用滑变改变运放的放大倍数,能放在反馈位置吗?
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可以使运放设计成固定增益放大器,滑动电阻器作为输入衰减器来实现总体增益的变化。如果是高频的话,建议使用VCA或者PGA,就是压控振荡器或者可编程增益放大器。