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Old 9th November 2006, 09:37 AM   #11
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tl072 and lf353 are the industry std. ones using in some very good actives
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Old 9th November 2006, 09:44 AM   #12
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Originally posted by lt cdr data
tl072 and lf353 are the industry std. ones using in some very good actives
Yeah and NE5532's are the industrie standard for output opamps and we all know they sound like ----, so do the TL072's and the LF353's.. It's because they can buy them in bulk for a couple of cents and they do the job, but only just.

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Old 9th November 2006, 07:32 PM   #13
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Originally posted by mlloyd1
i think the opa2604 is (at least designed to be) unity gain stable - no minimum gain requirement, such as the OPA637 has.

i think Nelson was pointing to something else in the design/operation of OPA2604?
The circuit didn't oscillate - it sounded bad.

This is a topic worthy of a thread all by itself, as it applies to
the sound of op amps, chip amps, and other circuits with
high open loop gains.

It is my observation that as the phase margin gets thin, the
sound starts to suffer, and while many of these circuits don't
show actual oscillation, the approach to that boundary puts
the behaviour into fractal territory.

It's easy to experiment with, as pointed out in the first post
of my thread "7 easy pieces"

The example schematic was:

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