[sdiy] Equal power law

[Rutger Vlek]

Thanks! I'll have a look at it!

Rutger

On 11 feb 2016, at 21:13, Matthias Herrmann wrote:

> 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
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>