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Old 21st September 2012, 05:52 AM   #1
Tolu is offline Tolu  Germany
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Default Design questions for opamp-based preamp

Hallo,

I'm planning a new preamp.

Two questions arose:
One stage (source-pot-opamp)
or
two stages (source-opamp-pot-opamp)

dual or mono opamps

and when using dual version:
L/R in one opamp or 1./2.stage

What sounds best?

Regards

Thomas

P.S.: planned opamp: LME49720HA
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Old 21st September 2012, 06:21 AM   #2
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It's all somewhat dependent on what you want and need. One stage should be fine for the vast majority of uses. Mono op amps are preferred; if you use a dual, use 1 for each channel. Your planned op amp is a dual, and it would be okay to use it for L/R.
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Old 21st September 2012, 09:24 AM   #3
Tolu is offline Tolu  Germany
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I am a little bit confused. You wrote take one dual opamp per channel and in the next sentence take one dual for both channels.
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Old 21st September 2012, 09:35 AM   #4
PMA is offline PMA  Europe
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When are you planning to start production?
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Old 21st September 2012, 09:58 AM   #5
Tolu is offline Tolu  Germany
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Quote:
Originally Posted by PMA View Post
When are you planning to start production?
I preordered at Foxconn capacities for about 100'000 pcs per month (at the expense of the iPhone 5 production).

Fortunately I made my millions in another business so I can bear too high stock buildings.
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Old 21st September 2012, 10:24 AM   #6
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Quote:
I am a little bit confused.
Sorry. Here's what I meant...
Ideally (and measurably also) you'd want to keep the L & R signal paths completely separate. As a practical matter, that may not be the wisest choice. Especially in light of the smaller/faster progress of electronics. Most audio op amps probably have a crosstalk spec, and it's probably low enough that it isn't worth fretting over.
So the chip you mentioned, the LME49720HA, is (if I'm not mistaken) a dual op amp. The LME49710HA being the single. Unless you prefer the bigger, more complex circuit using single op amp chips, the LME49720HA dual chip will do the job.
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