Universal Active Filters: Part 2

Here is another great Bil Herd article about Active Filters. Thank you HackaDay!

In this installment I’ll test the theory that filtering out the harmonics which make up a square wave results in a predictable degradation of the waveform until at last it is a sine wave. This sine wave occurs at the fundamental frequency of the original square wave. Here’s the video but stick with me after the break to walk through each concept covered.

via hackaday.com