[sdiy] Audio mixers

Andre Majorel aym-htnys at teaser.fr
Wed Jun 22 22:42:41 CEST 2011

On 2011-06-18 06:02 +1000, Stewart Pye wrote:

> If you use low noise and distortion op amps like the LM833 or NE5532
> the buffer will not impact on distortion. The only downsides I see
> are increased current consumption and cost.
> I also have "Small Signal Audio Design' by Douglas Self and highly
> recommend it.

When he published it, he took his op-amp pages down. The one on
the LM833 was not included in the book so here it is :


The 5532 crosses 10 PPM (0.001%) at 10 kHz worst case (600 ohms).
The LM833 crosses 10 PPM (0.001%) at 3 kHz best case (no load).
With a 1 kohm load, the LM833 never goes much below 20 PPM.

The test conditions were not exactly the same but I get the
impression that the LM833 is not in the same class as the 5532.

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

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