[sdiy] Audio mixers

Oren Leavitt obl64 at ix.netcom.com
Thu Jun 23 18:28:30 CEST 2011



On 6/23/2011 7:05 AM, Harry Bissell wrote:
> 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
>
>

Vacuum tube warmth on a chip - don't forget 6.3VAC for the filament pins :-)

- Oren

> ----- Original Message -----
> From: Andre Majorel<aym-htnys at teaser.fr>
> To: Synth-diy at synth-diy.org
> 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.
>




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