<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Dan,<div><br></div><div>I’ve been using the AS2164 only when I need the exponential response. If I need linear VCAs I now use the AS3364, which is more or less a clone of the SSM2024. That’s the same pinout more or less as the SSM2164 but has linear response. So, it’s very easy to use, pretrimmed, quiet, CV referenced to ground, summing node signal ins, doesn’t require all of those 560p caps. That works out great when lots of VCAs are needed, Some people were really turned off by the 1% harmonic distortion, but I have yet to notice an distortion on a synth circuit. </div><div><br></div><div><div style="display: block;"><div style="-webkit-user-select: all; -webkit-user-drag: element; display: inline-block;" class="apple-rich-link" draggable="true" role="link" data-url="https://www.alfarzpp.lv/eng/sc/AS3364.pdf"><a style="border-radius:10px;font-family:-apple-system, Helvetica, Arial, sans-serif;display:block;-webkit-user-select:none;width:228px;user-select:none;-webkit-user-modify:read-only;user-modify:read-only;overflow:hidden;text-decoration:none;" class="lp-rich-link" rel="nofollow" href="https://www.alfarzpp.lv/eng/sc/AS3364.pdf" dir="ltr" role="button" draggable="false" width="228"><table style="table-layout:fixed;border-collapse:collapse;width:228px;background-color:#E5E6E9;font-family:-apple-system, Helvetica, Arial, sans-serif;" class="lp-rich-link-emailBaseTable" cellpadding="0" cellspacing="0" border="0" width="228"><tbody><tr><td vertical-align="center" align="center"><img style="width:228px;filter:brightness(0.97);height:322px;" width="228" height="322" draggable="false" class="lp-rich-link-mediaImage" alt="preview.png" src="cid:0C8EC97A-8DA9-4445-8DD1-D4CFD78B1A20"></td></tr><tr><td vertical-align="center"><table bgcolor="#E5E6E9" cellpadding="0" cellspacing="0" width="228" style="font-family:-apple-system, Helvetica, Arial, sans-serif;table-layout:fixed;background-color:rgba(229, 230, 233, 1);" class="lp-rich-link-captionBar"><tbody><tr><td style="padding:8px 0px 8px 0px;" class="lp-rich-link-captionBar-textStackItem"><div style="max-width:100%;margin:0px 16px 0px 16px;overflow:hidden;" class="lp-rich-link-captionBar-textStack"><div style="word-wrap:break-word;font-weight:500;font-size:12px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-topCaption-leading"><a rel="nofollow" href="https://www.alfarzpp.lv/eng/sc/AS3364.pdf" style="text-decoration: none" draggable="false"><font color="#272727" style="color: rgba(0, 0, 0, 0.847059);">AS3364</font></a></div><div style="word-wrap:break-word;font-weight:400;font-size:11px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-bottomCaption-leading"><a rel="nofollow" href="https://www.alfarzpp.lv/eng/sc/AS3364.pdf" style="text-decoration: none" draggable="false"><font color="#808080" style="color: rgba(0, 0, 0, 0.498039);">PDF Document · 494 KB</font></a></div></div></td></tr></tbody></table></td></tr></tbody></table></a></div></div></div><div><br></div><div>Mark</div><div><br></div><div><br></div><div><br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Aug 8, 2024, at 8:08 PM, Dan Snazelle via Synth-diy <synth-diy@synth-diy.org> wrote:</div><br class="Apple-interchange-newline"><div>
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imagine someone asked you to make some new synth modules.</div>
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then imagine that the last time you did so in any quantity above one--- it was 2017. </div>
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I am trying to get a handle on what the parts landscape is like now for cost-effective CV control. Back in 2017 the lm13700 was really the only available OTA . I was just starting to work with the ssm2164 at the time but never used it extensively.</div>
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In the interim I have built synth circuits but only in quantities of one where cost was no object and I was able to rely on my own extensive parts supply. </div>
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So my question is this-- if I am thinking about design for manufacturing<span class="_Entity _EType_OWA_HYPHEN _EId_OWA_HYPHEN_1 _EReadonly_1" style="display: inline-block;"><span id="hyphen2" class="hyphen">—</span></span>what do you think the best option
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Has anyone tried the quad ALFA OTA? Is it even readily available? Same for the new SSM2040. </div>
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OR would you just use the 2164 instead? </div>
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OR would you just try to make discrete OTAS out of say the BCM856DS //BCM847BS</div>
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thanks for any and all opinions on this. </div>
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