Today we will build analogue filters to shape wave forms.  Filters are networks that process signals in a frequency-dependent manner. The basic concept of a filter can be explained by examining the frequency dependent nature of the impedance of capacitors and inductors.

simple schematic diagram of a low pass filetr

simple schematic diagram of a low pass filter

There is a great tutorial at http://www.electronics-tutorials.ws/filter/filter_1.html

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