LOVING my new amp (Objective2)

[mikeaj]

Any idea about the noise levels, which look a few orders of magnitude off, and the other things pointed out?  Instrumentation error, notational error (uh, microvolts as mV instead of μV?  heh), or build error?  For that matter, was it you or your friend that took the scope shots and the pictures?
 
Do you hear noise from the amp with sensitive headphones or IEMs?  Somehow if the noise were in the milivolts range, I don't think that would sound clean with many headphones, to say the least.

 

[stv014]

Quote:

Originally Posted by bowei006 /img/forum/go_quote.gif
 
Burr Brown op amp

 
What op amp is it exactly ? It is not clearly visible on any of the pictures. Is it the OPA2227 ?

 

[bowei006]

Quote:

 
What op amp is it exactly ? It is not clearly visible on any of the pictures. Is it the OPA2227 ?

OPA2228
 
The OPA2227 was on the list of high performance in the docs, however he didn't really recommend it as although it was better and fit in the High Performance section it was too expensive and had a price of some of the elite op amps. My friend happened to have a lot of OPA2228's......The OPA2228 is a very small if not inaudible upgrade(spec wise) from the 2227..... he could get these chips for a lot cheaper than we can get them so it really wasn't a problem