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Just made my first CMOY, what next? - Page 2

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post #16 of 17

4/11/11 at 9:24am

Thread Starter

14 Posts. Joined 3/2011
Select All Posts By This User

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:

3ch design?
Addition of buffers in the output stage?
Biasing into class A?

post #17 of 17

4/12/11 at 7:58pm

282 Posts. Joined 12/2006
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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.