## Low Pass FilterOne of the uses of RC circuits is filtering signals. Dr. Fourier tells us that every wave-form is really a composition of sine waves of different frequencies. The low=pass filter lets us filter out the high=frequency components of a signal, letting us focus on the low frequencies we may be interested in. A low pass filter looks like this: You can think of it as a voltage divider that's frequency dependent. Or, you can think of the high frequencies traveling straight through the cap to ground, and the low frequencies bouncing off the cap and getting sent to Signal Out. The low frequencies keep most of their strength. The high frequencies
are reduced. At a certain frequency, called f We can calculate f So, if we know what frequencies
we wish to filter out, we can choose an f |

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