[sdiy] Equal power law

[Rutger Vlek]

Ha, wat I meant was something that doesn't use a VCA to generate the curve itself. Of course you need a VCA to feed the curve to, in order to get panning.

Rutger


On 11 feb 2016, at 21:18, Mattias Rickardsson wrote:

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