what can be the max gain for opa549?

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arvin_ray said:
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.
 
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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