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Old 1st May 2005, 03:47 AM   #1
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Default what can be the max gain for opa549?

what can be the max gain for opa549?

is it 22 too high?

can it be set to 25?

what is the best gain to fit for those OPA549?

which do you preffer OPA549 or OPA541?
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Old 1st May 2005, 01:18 PM   #2
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1 Check application note

2.Yes, it will lower high frequecy response. It's OK for subwoofer amp

3. Yes, again it will lower high frequecy response

4. Anything up to 10

5. I have not worked with OPA541 yet.
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Old 1st May 2005, 04:39 PM   #3
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Default Re: what can be the max gain for opa549?

Quote:
Originally posted by arvin_ray
what can be the max gain for opa549?

is it 22 too high?
For either the OPA541/8/9 that's high.
You shouldn't go higher than around 10x gain if you want a good sounding amp.
Also, they are much noisier than the LM chips, so at higher gains you will notice some hiss.
Those who use these chips at higer gains would be surprized by the improvements at lower gains.

You must use a gain of up to 10x, and a previous gainstage with the gain you need.
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Old 1st May 2005, 07:08 PM   #4
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ok tnx j
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Old 2nd May 2005, 03:09 PM   #5
macboy is offline macboy  Canada
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Before deciding to use the OPA549 (or OPA541) for anything other than a subwoofer amp, read and understand the information in the data sheets. Note that the distortion in the higher audio frequencies is very high. With the 549, expect around 5% (yes five percent) distortion in the upper octave at any power level. The distortion in the lower frequencies (typically used for a subwoofer amp) is much lower, in the hundredth's of a percent.

Granted, some types of distortion can sound pleasing to the ear. This is one reason that tube amps are very popular amoung certain devotees. They are not accurate amps but they can sound very nice. But I've never heard of anyone claiming that the distortion produced by a solid-state amp (like these opamps) sounds nice.
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