<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">I got a feeling a Baxandall is going to be a real pain to get under control with a 2164, but probably easier than tuning a Twin T or a Wein bridge network.</div><div dir="ltr"><br></div><div dir="ltr">I think pretty much any circuit that requires both sides of the potentiometer, or even worse, both sides of a dual gang pot, is going to be difficult.</div><div dir="ltr"><br></div><div dir="ltr">But not impossible. Not something I plan on trying, but not impossible. </div><div dir="ltr"><br></div><div dir="ltr">-Stephen</div><div dir="ltr"><br><blockquote type="cite">On Feb 9, 2024, at 14:20, David G Dixon via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div dir="ltr" align="left"><span class="728591519-09022024">Not sure about Baxandall,
but recently I figured out how to put the Korg morphing LFO circuit under
voltage control using 2164. I figure that if that is possible, then the
Baxandall circuit should be a piece of cake. The big problem with 2164 is
that it has to terminate at a virtual ground, so that means that some inverting
opamps always have to be shoehorned in there, even if they are not really needed
or wanted.</span></div>
<div dir="ltr" align="left"><span class="728591519-09022024"></span> </div>
<div dir="ltr" align="left"><span class="728591519-09022024">I'll work up the
Baxandall circuit this weekend and report back with my findings, and maybe a
demo, next week.</span></div><br>
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<font size="2" face="Tahoma"><b>From:</b> Mike Bryant
[mailto:mbryant@futurehorizons.com] <br><b>Sent:</b> Friday, February 09, 2024
2:18 AM<br><b>To:</b> Adam (synthDIY); David G Dixon<br><b>Cc:</b>
synth-diy<br><b>Subject:</b> Re: [sdiy] Unique sounding modules that can't have
voltage control?<br></font><br></div>
<div></div>
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<div style="FONT-FAMILY: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 12pt" class="elementToProof"><br></div>
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<div style="FONT-FAMILY: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 12pt" class="elementToProof"><span style="FONT-SIZE: 11pt"><br>> On 9 Feb 2024, at
2:27 pm, David G Dixon via Synth-diy <synth-diy@synth-diy.org>
wrote:<br>><br>> I doubt that there are many things that couldn't be put
under voltage<br>> control with a 2164 and a bit of
ingenuity.<br></span></div>
<div style="FONT-FAMILY: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 12pt" class="elementToProof"><span style="FONT-SIZE: 11pt"><br></span></div>
<div style="FONT-FAMILY: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 12pt" class="elementToProof"><span style="FONT-SIZE: 11pt">Baxandall tone control
? I imagine it would make the op-amp unstable without a lot of
extra caps.<br></span></div>
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