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[[File:Low_pass_filter.svg|thumb|right|300px|The low pass RC filter. A two port network.]]
The way to remember the two circuits is to think about how the capacitor acts at various signal frequencies. At high frequencies capacitors act like wires. At low frequencies capacitors act like
An important use of low pass filters is for the anti-aliasing circuity on the input of an A/D converter or the output of a D/A converter. An important use of a high pass filter is to remove the DC offset of a signal. For example, it's possible to use a power supply that is +5 Volts to GND to generate a sine wave from a D/A converter and use a high pass filter to change the sine wave to a +2.5 to -2.5 Volt signal at the output.
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