<div dir="auto"> THAT had this design note on their site which is what I was reading <div dir="auto"><br></div><div dir="auto"><a href="http://www.thatcorp.com/datashts/dn120.pdf">http://www.thatcorp.com/datashts/dn120.pdf</a><br><div dir="auto"><br></div><div dir="auto"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 27, 2020, 7:15 PM S Ridley <<a href="mailto:spridley1@gmail.com" target="_blank" rel="noreferrer">spridley1@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">>
Separate question: Is there any analog way that *does* give a constant power panning curve?<div><br></div><div>Serge Modular were keen on equal power panning. I think they did some square root stuff by logging the CV, halving it and letting the expo response of the VCAs do the anti-logging. </div><div><br></div><div>Steve</div><div> </div><div><br></div><div><br></div><div><br></div><div><br></div></div><div id="m_3287898587970275343m_3140675764637660936DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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</table><a href="#m_3287898587970275343_m_3140675764637660936_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1" rel="noreferrer noreferrer"></a></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 27 Nov 2020 at 20:08, Tom Wiltshire <<a href="mailto:tom@electricdruid.net" rel="noreferrer noreferrer" target="_blank">tom@electricdruid.net</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>Do you mean this one? “VCAs in a Pan potentiometer Application”:<div><br></div><div><span style="white-space:pre-wrap"> </span><a href="http://www.thatcorp.com/datashts/dn120.pdf" rel="noreferrer noreferrer" target="_blank">http://www.thatcorp.com/datashts/dn120.pdf</a></div><div><br></div><div>Personally, I never liked the hacky make-it-nonlinear approach. In practice it works more than well enough. If it was me, I’d use a lookup table and a DAC. Whatever floats your boat, I guess…;)</div><div><br></div><div>Separate question: Is there any analog way that *does* give a constant power panning curve? I remember seeing the “expo crossfade” example from the SSM2024 datasheet which uses a differential pair to split a linear control current between two linear VCAs (e.g. not applicable to the expo VCAs we’re discussing here) . If I remember correctly, when I tried it, it gives subtle “hole in the middle” effect as a panner, as the volume apparently drops as the signal reaches the centre. This experiment was a long while ago though, and I might be mis-remembering.</div><div><br></div><div>What others have said about the VCAs is all true - you pick the cost/quality ratio you’re after and then the parts choice will make itself!</div><div><br></div><div>Tom</div><div><br><div>
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<div><br><blockquote type="cite"><div>On 27 Nov 2020, at 16:27, Ben Gebhardt via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" rel="noreferrer noreferrer" target="_blank">synth-diy@synth-diy.org</a>> wrote:</div><br><div><div dir="auto"><div dir="ltr">I second what Eric said and would note that THAT has a good app note for a pan pot application which I used for a mastering grade cross fader. Worth a look.</div><div dir="ltr"><br><blockquote type="cite">On Nov 27, 2020, at 10:50 AM, Eric Schlappi <<a href="mailto:eric.schlappi@gmail.com" rel="noreferrer noreferrer" target="_blank">eric.schlappi@gmail.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>if you are going off of the THAT Corp app note for equal power panning, it is totally possible to adapt that to the ssi2164. Just change the scaling and you need to invert and offset one side.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 27, 2020 at 7:27 AM drheqx <<a href="mailto:drheqx@gmail.com" rel="noreferrer noreferrer" target="_blank">drheqx@gmail.com</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">I'm looking at the THAT2180A for a voltage controlled pan pot application. They're not cheap. Any ideas for a less expensive vc pan pot?<div dir="auto"><br></div><div dir="auto">Mike</div></div>
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