[sdiy] Panning with LM13700

Laurie elby_designs at ozemail.com.au
Mon Jan 9 23:13:21 CET 2017


Have you looked at the Serge Equal Power Panner?
Go to my site or Ken Stones CGS site and look at CGS102.
PCB and Component Kits available to DIY it

Best Regards
Laurie Biddulph
Mobile: +61 0400 257 645
Phone.: +61 02 4340 0938
Web...: www.elby-designs.com
Skype.: widgetoz

Elby Designs
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Kariong
NSW 2250
Australia

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Happy New Year


On 10/01/2017 8:29 AM, microtonalsynthesis at yahoo.com wrote:
> Like many app notes, the THAT AN120 is something of a DIY project in 
> itself.
>
> The control voltage inputs are reversed. U1 should use EC+ pin 2 and 
> U2 should use EC- pin 3.
>
> 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.
>
> John
>
>
> On Sunday, January 1, 2017 6:24 PM, Richie Burnett 
> <rburnett at richieburnett.co.uk> wrote:
>
>
> 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.
>
> -Richie,
>
> Sent from my Xperia SP on O2
>
> ---- Tom Wiltshire wrote ----
>
> >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!
> >
> >I'll have a look over it and see if I couldn't use the gist of it in 
> a simpler way.
> >
> >On 1 Jan 2017, at 20:14, Tom Bugs <admin at bugbrand.co.uk 
> <mailto:admin at bugbrand.co.uk>> wrote:
> >
> >> Not LM13700 based, but the details within the THAT app note here 
> may be some use:: http://www.thatcorp.com/datashts/dn120.pdf (VCAs in 
> pan pot apps)
> >>
> >>
>
> >>>>> -----Ursprüngliche Nachricht-----
> >>>>> Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org 
> <mailto:synth-diy-bounces at synth-diy.org>] Im Auftrag von Tom
> >>>>> Wiltshire
> >>>>> Gesendet: Sonntag, 1. Januar 2017 18:07
> >>>>> An: Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
> >>>>> Betreff: [sdiy] Panning with LM13700
> >>>>>
> >>>>> Hi All,
> >>>>>
> >>>>> Happy New Year to everyone! Here's hoping you all have a great 
> year with
> >>>>> many (completed) synth projects.
> >>>>>
> >>>>> I've got  quick question - what's the best way to do equal power 
> panning (-
> >>>>> 3dB in the centre) with the LM13700? I'm assuming that such a 
> thing has
> >>>>> been done already, so it's seems silly to reinvent the wheel, 
> but I can't
> >>>>> find anything that isn't a simple linear crossfade (which is ok for
> >>>>> crossfading, but not so good for panning).
> >>>>>
> >>>>> Any tips/pointers appreciated.
> >>>>>
> >>>>> Thanks,
> >>>>> Tom
>
>
>
>
>
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