[sdiy] Lowest distortion neede for VCA

Andre Majorel aym-htnys at teaser.fr
Mon Sep 16 19:14:44 CEST 2013


On 2013-09-16 18:34 +0200, Harald wrote:

> I am just in the proces measuring THD while varying Id, I_abc
> and input. Vpp. Preliminary result for I_abc is that
> increasing it over 0.8mA have no impact in THD. I increased it
> up to 1.5mA and THD stayed constant.. (Id set to 1.4mA)
> 
> The LM13700 varys a lot. I checked 5 pieces and they varied
> between 0.1%THD to 0.4%THD in the same seting. So some
> selection is needed to obtain best results.
> 
> Later i will check 3080 and 3280 for comparison .

Pardon me for stating the obvious but... If you're looking for
high fidelity, wouldn't it make more sense to use one of the
following ?
- AD SSM2164 / Coolaudio V2164
- THAT 2162 / Coolaudio V2162
- THAT 2180
- THAT 2181 / Coolaudio V2181

-- 
André Majorel http://www.teaser.fr/~amajorel/



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