Just made my first CMOY, what next?
Apr 11, 2011 at 12:24 PM Post #16 of 17
Thanks for the all the suggestions everyone.    However, I need a portable solution to drive 600ohm headphones.  Thus I need something that is NOT a desktop amp and can deliver >9v, thus why I made a 2x9v CMOY.
 
 
I'm also still trying to get any feedback as to how the following impacts the sonic qualities of the amp:
  1. 3ch design?
  2. Addition of buffers in the output stage?
  3. Biasing into class A?
 
Apr 12, 2011 at 10:58 PM Post #17 of 17
Hi--
 
Presuming you have a music source without significant DC offset (can be checked with a voltmeter) you can improve audio quality of the CMoy by replacing the input capacitors with 1 K resistors. I did this and the improvement is obvious. I am using the OPA 2227 op amp and must say that this is really my favorite headphone amp. Mine is setup for 12v from a wall transforrmer rather than for portable use.
 
F
 
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