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Re: PSRR of 6172

Posted by Thorsten (M) on February 9, 2002 at 04:01:12

In Reply to: PSRR of 6172 posted by Ehien on February 8, 2002 at 16:58:41:

Hi,

Also something to consider, with the 6172 Distortion is dominated by 3rd order harmonics (not that is much of them but still) while with the LM6182 (if applied correctly) the 2nd Harmonics are dominant. Now all this happens below -100db but it is still the best theory I have as to the (arguably small but noticable) differences between chips that are almost idenical with only an additional buffer section on the negative input allowing Voltage feedback.

BTW, I'f may wager, the leanness and thinness is likely more the SSM2017 (because that what it sounds like - incisive, cutting and lean, if with great detail) than the LM6172, it just does "nice up" things like some others do.

How about trying to change all signal relevant resistors to Carbon Types. On Solid State gear, especially Op-Amp sort of stuff I tend to prefer these sonically and how about some Elna Silmic PSU Capacitors which reduce the distortion fed back into the Op-Amp from the Supply rails?

Ciao T

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