[sdiy] Equal power law

[Matthias Herrmann]

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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