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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Same here.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We adopted the AN120 for 12V operation and used it for a 4U Stereo Mixer (ala Serge).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">After some simulations and real life testing we were able to go with just the center trimmer, using 1% resistors. However, we used it with the nice pre-trimmed
THAT2180 VCAs.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> Synth-diy [mailto:synth-diy-bounces@synth-diy.org]
<b>On Behalf Of </b>Tom Bugs<br>
<b>Sent:</b> Tuesday, January 10, 2017 10:05 AM<br>
<b>To:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] Panning with LM13700<o:p></o:p></span></p>
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<p>Yes, I agree -- THAT notes often need some detailed consideration - they use some absolutely bizarre resistor values.<o:p></o:p></p>
<p>I actually used the AN120 idea basis with V2164 VCAs - took quite a lot of multisim investigation first and then some physical prototyping afterwards.<o:p></o:p></p>
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<p class="MsoNormal">On 09/01/2017 21:29, <a href="mailto:microtonalsynthesis@yahoo.com">
microtonalsynthesis@yahoo.com</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">Like many app notes, the THAT AN120 is something of a DIY project in itself. <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">The control voltage inputs are reversed. U1 should use EC+ pin 2 and U2 should use EC- pin 3. <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">The breakpoint generator is very sensitive to offsets and the circuit as given has unequal volumes for left and right sides. Adjustment of all resistors going to
-15V is needed. I estimate about 130.5K for the 133K. Of course, if you adapt this circuit to 12V supplies then you need to adjust some more.<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Helvetica",sans-serif">John<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">On Sunday, January 1, 2017 6:24 PM, Richie Burnett
<a href="mailto:rburnett@richieburnett.co.uk"><rburnett@richieburnett.co.uk></a> wrote:</span><span style="font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-family:"Helvetica",sans-serif">You could always generate the two VCA control signals with the appropriate pan law using a micro... Low cost pic with dual output PWM perhaps?
Pre-calculated values in lookup table on a low end micro, or use quadratic fit approximation if you're already using a dspic.<br>
<br>
-Richie,<br>
<br>
Sent from my Xperia SP on O2<br>
<br>
---- Tom Wiltshire wrote ----<br>
<br>
>That's a fairly involved circuit, but I don't think I've ever seen an analog panner with a switch to select different pan laws. Very impressive!<br>
><br>
>I'll have a look over it and see if I couldn't use the gist of it in a simpler way.<br>
><br>
>On 1 Jan 2017, at 20:14, Tom Bugs <<a href="mailto:admin@bugbrand.co.uk">admin@bugbrand.co.uk</a>> wrote:<br>
><br>
>> Not LM13700 based, but the details within the THAT app note here may be some use::
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.thatcorp.com_datashts_dn120.pdf&d=DgMD-g&c=P3aKjizb3qsxp0SERaL2sw&r=Wo0ERRj3NwEx1MVmRi7Tj3kJss6CkyI0BMe1OujCfok&m=zDrgDUI_B8TYLbrZSvO6ojF6fSU0kZnkFRmtt5rxCkA&s=RUKy4NpD3YapLxB0c-TAwlM740cD6Gu90CN6Ve-p1kc&e=" target="_blank">
http://www.thatcorp.com/datashts/dn120.pdf </a>(VCAs in pan pot apps)<br>
>> <br>
>> <br>
<br>
>>>>> -----Ursprüngliche Nachricht-----<br>
>>>>> Von: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" id="yui_3_16_0_ym19_1_1483995648311_12086">synth-diy-bounces@synth-diy.org</a>] Im Auftrag von Tom<br>
>>>>> Wiltshire<br>
>>>>> Gesendet: Sonntag, 1. Januar 2017 18:07<br>
>>>>> An: <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>
>>>>> Betreff: [sdiy] Panning with LM13700<br>
>>>>> <br>
>>>>> Hi All,<br>
>>>>> <br>
>>>>> Happy New Year to everyone! Here's hoping you all have a great year with<br>
>>>>> many (completed) synth projects.<br>
>>>>> <br>
>>>>> I've got quick question - what's the best way to do equal power panning (-<br>
>>>>> 3dB in the centre) with the LM13700? I'm assuming that such a thing has<br>
>>>>> been done already, so it's seems silly to reinvent the wheel, but I can't<br>
>>>>> find anything that isn't a simple linear crossfade (which is ok for<br>
>>>>> crossfading, but not so good for panning).<br>
>>>>> <br>
>>>>> Any tips/pointers appreciated.<br>
>>>>> <br>
>>>>> Thanks,<br>
>>>>> Tom<br>
<br>
<o:p></o:p></span></p>
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