<p dir="ltr">But poor Rutger wanted something *without* VCAs. :-)</p>
<p dir="ltr">I just browsed through Douglas Self's small signal book without finding anything that was enough spot on to advice about.</p>
<p dir="ltr">/mr<br>
</p>
<div class="gmail_quote">Den 11 feb. 2016 9:13 em skrev "Matthias Herrmann" <<a href="mailto:matthias.herrmann@fonik.de">matthias.herrmann@fonik.de</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">it is the one we used as basis for a stereo mixer module<br>
<a href="http://www.thatcorp.com/datashts/dn120.pdf" rel="noreferrer" target="_blank">http://www.thatcorp.com/datashts/dn120.pdf</a><br>
<br>
cheers,<br>
matthias<br>
<br>
<br>
> -----Ursprüngliche Nachricht-----<br>
> Von: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@dropmix.xs4all.nl">synth-diy-bounces@dropmix.xs4all.nl</a>] Im Auftrag von<br>
> Neil Johnson<br>
> Gesendet: Donnerstag, 11. Februar 2016 20:15<br>
> An: Rutger Vlek<br>
> Cc: Synth DIY<br>
> Betreff: Re: [sdiy] Equal power law<br>
><br>
> Hi Rutger,<br>
><br>
> > Inspired by the lin/exp/log thread, I've been wondering about<br>
> implementation of other curves, most specifically those used for equal<br>
> power law and BBC panning law (center at -3dB or center at -4.5dB).<br>
> ><br>
> > Are there simple ways to approximate these curves in analog domain (e.g.<br>
> without using a VCA). I've been playing in Spice with an approximation of<br>
> the curve using a simple opamp circuit with back-to-back zeners. The zeners<br>
> already have a rather 'soft knee', but I'd like to know if there are ways<br>
> to get the shape even closer to what's needed for an equal power law curve.<br>
><br>
> There's a THAT app note where they use diode function generators to<br>
> approximate the sin/cos curves for panning VCAs.<br>
> Don't remember the number at the moment but there aren't that many<br>
> THAT app notes.<br>
><br>
> Neil<br>
> --<br>
> <a href="http://www.njohnson.co.uk" rel="noreferrer" target="_blank">http://www.njohnson.co.uk</a><br>
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</blockquote></div>