<div><br></div><div dir="auto">I’ve done some simulations but haven’t made the PCBs yet. The familiar “linearized 2164” circuit can be adapted to make the equal power curve instead of linear. </div><div dir="auto"><br></div><div dir="auto">David Dixon mentioned it awhile back and then I started messing around with it. According to the sim I set up, the CV curve was a recognizable to the Serge style equal-power-curves.</div><div dir="auto"><br></div><div dir="auto">-dk </div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Fri, Nov 27, 2020 at 7:15 PM S Ridley <<a href="mailto:spridley1@gmail.com">spridley1@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><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_8653345436917580256DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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</tbody></table><a href="#m_8653345436917580256_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></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" target="_blank">tom@electricdruid.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><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" 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" 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" 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" target="_blank">drheqx@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><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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