[sdiy] The TL072

[Altitude]

I see your point.  

The reason I am focusing in on the mix amp is when I tap the individual
outs, the SNR is quite good but the mixed outs have a substantial amount of
noise.  Should I be looking elsewhere for the source?  There really is not
too much in the signal path

-----Original Message-----
From: Paul Schreiber [mailto:synth1 at airmail.net] 
Sent: Friday, February 20, 2009 11:47 AM
To: Altitude; 'Synth DIY'
Subject: Re: [sdiy] The TL072

Drop-in.

Now, here is something to think about :)

There is a good chance that the 'noise' is not internally generated by the
TL072. Rather, it is being picked up and amplified by that stage. In many
cases, adding a 'better' op amp will make matters *worse*, because of the
higher bandwidth of the new part, even *more noise* gets through.

In other words, swapping out the 'last op amp in the signal path' may not
achieve what you are looking for.

Paul S.




----- Original Message -----
From: "Altitude" <altitude at optrand.com>
To: "'Paul Schreiber'" <synth1 at airmail.net>; "'Synth DIY'" 
<synth-diy at dropmix.xs4all.nl>
Sent: Friday, February 20, 2009 10:41 AM
Subject: RE: [sdiy] The TL072


> Thanks Paul,
>  To clarify about my application: I am trying to clean up some of the 
> noise
> on the mixer of my 9090 and the schems call for a TL072 part.  Is the
> OP275GPZ a drop in replacement?
>
> -----Original Message-----
> From: Paul Schreiber [mailto:synth1 at airmail.net]
> Sent: Friday, February 20, 2009 11:31 AM
> To: Altitude; 'Synth DIY'
> Subject: Re: [sdiy] The TL072
>
> TL072ACP
>
> A *much* better part is the OP275GPZ.
>
> Paul S.
>
>
> ----- Original Message -----
> From: "Altitude" <altitude at optrand.com>
> To: "'Synth DIY'" <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, February 20, 2009 10:07 AM
> Subject: [sdiy] The TL072
>
>
>>I have seen so many variants of this op amp. Which is the best, low noise
>> version for audio applications (i.e. summing amp)?
>>
>> Cheers.
>> Raph
>>
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>
>