[sdiy] Panning with LM13700

Andre Majorel aym-htnys at teaser.fr
Sat Jan 14 06:31:10 CET 2017

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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