<div>I'm looking at this one: <a href="http://www.synthfool.com/docs/Buchla/Buchla_200/291/Buchla_2910.jpg">http://www.synthfool.com/docs/Buchla/Buchla_200/291/Buchla_2910.jpg</a> Is it different than the one you're looking at?</div>
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<div>It looks like SVF to me, but you have to remember than the "states" (I'm about 90% sure I'm really abusing the control systems terminology here, but bear with me) include all three possible outputs, all three possible inputs, every possible branch...</div>
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<div>So to me it looks like *both* the input and output are in different nodes than in the common tow-thomas and KHN topologies. And there seem to be extra branches added for stability. And C6 is making everything unnecessarily complicated, analysis-wise. Really tempting for me to analyze it instead of listening to my assembly coding professor lecture for the next hour.</div>
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<div>Hope that helps,</div>
<div>Walker</div>
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<br><br><div class="gmail_quote"><p>On Fri, Aug 28, 2015 at 1:52 AM, Pete Hartman <span dir="ltr"><<a href="mailto:pete.hartman@gmail.com" target="_blank">pete.hartman@gmail.com</a>></span> wrote:<br></p><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div dir="ltr">Are there any analyses anyone's aware of about how the 291 works?<div><br></div>
<div>Looking at the Dustin Stroh schematic, it looks *sort of* like a state variable filter, but not quite, so that throws me off a bit. Maybe it's just that the schematic is oddly drawn, I think the last time I asked a question like this it was a matter of re-arranging the bits to see it :)</div>
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<div>Trying to determine if what I'm seeing with one is "normal" or not, and with Buchla circuits, I can't just fall back on "does it behave like all these other filters I have". :)</div>
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<div>Thanks</div>
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<div>Pete</div>
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