<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Again, that's the key: "but not impossible". Ok, some of this stuff is a pain in the a55 to do, but given enough enough time and money, it can be done, modelled digitally, replaced with a half-acre of analogue circuit, whatever. No, it's not impossible. Just not worth it.<br class=""><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On 9 Feb 2024, at 22:00, Stephen Makdisi <<a href="mailto:shmakdisi@xvetrd.us" class="">shmakdisi@xvetrd.us</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class=""><br id="lineBreakAtBeginningOfSignature" class=""><div dir="ltr" class="">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" class=""><br class=""></div><div dir="ltr" class="">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" class=""><br class=""></div><div dir="ltr" class="">But not impossible. Not something I plan on trying, but not impossible. </div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">-Stephen</div><div dir="ltr" class=""><br class=""><blockquote type="cite" class="">On Feb 9, 2024, at 14:20, David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""><br class=""></blockquote></div><blockquote type="cite" class=""><div dir="ltr" class="">
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<div dir="ltr" align="left" class=""><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" class=""><span class="728591519-09022024"></span> </div>
<div dir="ltr" align="left" class=""><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 class="">
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<font size="2" face="Tahoma" class=""><b class="">From:</b> Mike Bryant
[<a href="mailto:mbryant@futurehorizons.com" class="">mailto:mbryant@futurehorizons.com</a>] <br class=""><b class="">Sent:</b> Friday, February 09, 2024
2:18 AM<br class=""><b class="">To:</b> Adam (synthDIY); David G Dixon<br class=""><b class="">Cc:</b>
synth-diy<br class=""><b class="">Subject:</b> Re: [sdiy] Unique sounding modules that can't have
voltage control?<br class=""></font><br class=""></div>
<div class=""></div>
<table style="PADDING-LEFT: 0px; BORDER-COLLAPSE: collapse" class="">
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<td class=""><font style="padding: 3px; line-height: 1.6; background-color: rgb(255, 236, 179); font-style: normal; font-family: Arial, sans-serif; font-size: 12px; font-weight: normal;" class="">[<strong class="">CAUTION:</strong>
Non-UBC Email]</font></td></tr></tbody></table>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="elementToProof"><br class=""></div>
<div id="appendonsend" class=""></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="elementToProof"><span style="FONT-SIZE: 11pt" class=""><br class="">> On 9 Feb 2024, at
2:27 pm, David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>>
wrote:<br class="">><br class="">> I doubt that there are many things that couldn't be put
under voltage<br class="">> control with a 2164 and a bit of
ingenuity.<br class=""></span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="elementToProof"><span style="FONT-SIZE: 11pt" class=""><br class=""></span></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;" class="elementToProof"><span style="FONT-SIZE: 11pt" class="">Baxandall tone control
? I imagine it would make the op-amp unstable without a lot of
extra caps.<br class=""></span></div>
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