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Why do low and high-pass filters differ so much when they have the same components?

The simplest low- and high-pass filters both have a capacitor and a resistor in series in a four-terminal network. However in the low-pass case, the output voltage is across the capacitor, and in the high-pass case, the output voltage is across the resistor. Here's a qualitative description of what's going on in each filter case:


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Kate Scholberg 2017-02-13