Simple circuit generates clean sine waves
Figure 1 shows a technique for generating a high-quality sine wave from a square-wave source. Using textbook methodology, you can easily convert a square wave into a sine wave: Feed a square wave at the desired frequency into an appropriate four- to six-pole lowpass filter. …
Read more original source:
http://www.edn.com/archives/1997/061997/13di_01.htm
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