A filter that blocks low frequencies and allows higher frequencies to pass through. Such filters are used in devices such as POTS splitters that direct phone and DSL signals to different lines.

Notch filters pass both high and low frequencies ... The T with two resistors and a capacitor to ground is a simple lowpass filter, essentially a passive version of the one we made above.

Check your current filter. The easiest way to find the size you need is to look at the filter that's already inside of your ...

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