<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div dir="auto">
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="m_-1593928049870735885917571417-04042017">The "sine wave" being generated by that 3RC circuit is
not very good, with 4 or 5% THD at best. A sine wave from a good
sine VCO would be less than 1%, and a self-oscillating filter sine can be
0.1%.</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="m_-1593928049870735885917571417-04042017"></span></font></div></div></blockquote><div><br></div><div>is it "not very good" meaning "the output will be filled with static and you can't hear the note" or "the waveform isn't a perfect sine wave and will be fuzzy"? Because a little character I can deal with.</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="ltr" align="left"> </div>
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="m_-1593928049870735885917571417-04042017">Plus, this circuit only works at one frequency.
It would have to be redesigned for other frequencies.</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="m_-1593928049870735885917571417-04042017"></span></font> </div></div></blockquote><div><br></div><div>In what I'm doing it only needs to work for one frequency and the other 90 can work on the rest of the notes. I'm not opposed to sitting with a notebook and a calculator and crunching some numbers, it'll take me back to high school math classes :)</div><div> </div></div><br></div></div>