[sdiy] Audio mixers

[Harry Bissell]

The 5532 is a wonderful opamp if you can satisfy its two desires... A very low input impedance
(less than 1K ohms) and LOTS and LOTS of power supply current.

I use this for a preamp for my hex guitar pickup, where btw, the bad gain bandwidth product actually
helps the frequency response :^)

H^) harry


----- Original Message -----
From: Andre Majorel <aym-htnys at teaser.fr>
To: synth-diy at dropmix.xs4all.nl
Sent: Wed, 22 Jun 2011 16:42:41 -0400 (EDT)
Subject: Re: [sdiy] Audio mixers

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 :

  http://www.teaser.fr/~amajorel/misc/lm833.htm

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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-- 
Harry Bissell & Nora Abdullah 4eva