[sdiy] Panning with LM13700

microtonal microtonalsynthesis at yahoo.com
Sun Jan 15 22:57:45 CET 2017


Probably. I was referring to what was in the THAT application note.

Sent from my iPad

> On Jan 14, 2017, at 12:31 AM, Andre Majorel <aym-htnys at teaser.fr> wrote:
> 
>> On 2017-01-14 01:57 +0000, microtonalsynthesis at yahoo.com wrote:
>> 
>> The input CV is 0 to +5V and that needs to be split at zero
>> volts. One CV is positive only and the other is negative only.
>> If you look at the chart in the THAT AN120, you'll see that
>> you cannot simply derive one CV from the other. They are
>> symmetric across the vertical axis, not the horizontal axis.
>> The breakpoint circuit is almost symmetric but there are
>> additional offsets applied for the left CV generation. Every
>> offset adds to the DC error and therefore adds to the panning
>> and volume error. John
> 
> Since you're talking about CV range... Wouldn't you prefer a
> bipolar CV, eg -2.5 V to pan hard left and +2.5 V to pan hard
> right ? Having centre as the neutral point seems more intuitive
> and it's generally easier to return to 0 V than to 2.5 V.
> 
> -- 
> André Majorel http://www.teaser.fr/~amajorel/
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