<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 9, 2024 at 11:04 PM Stephen Makdisi <<a href="mailto:shmakdisi@xvetrd.us">shmakdisi@xvetrd.us</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><br id="m_3892582184876285301lineBreakAtBeginningOfSignature"><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></blockquote><div><br></div><div>Can you suggest some modules that use those topologies? Am I right to think that the 808 BD is a Twin T? What module uses a Wien bridge?<br></div><div> </div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><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. <br></div></div></blockquote><div><br></div><div>Thanks a lot! Where do you think the difficulty comes from?<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div dir="ltr"></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 <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<div dir="ltr" align="left"><span>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></span> </div>
<div dir="ltr" align="left"><span>I'll work up the
Baxandall circuit this weekend and report back with my findings, and maybe a
demo, next week.</span></div><br>
<div dir="ltr" lang="en-us" align="left">
<hr>
<font size="2" face="Tahoma"><b>From:</b> Mike Bryant
[mailto:<a href="mailto:mbryant@futurehorizons.com" target="_blank">mbryant@futurehorizons.com</a>] <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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<td><font style="padding:3px;line-height:1.6;background-color:rgb(255,236,179);font-style:normal;font-family:Arial,sans-serif;color:rgb(0,0,0);font-size:12px;font-weight:normal">[<b>CAUTION:</b>
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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"><br></div>
<div id="m_3892582184876285301appendonsend"></div>
<div style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;color:rgb(0,0,0);font-size:12pt"><span style="font-size:11pt"><br>> On 9 Feb 2024, at
2:27 pm, David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>>
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"><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"><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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