[moiznoise]

Hey Everybody. First time posting here, but long time reader. I just purchased the JDS Labs cMoy v2.03 and the Beyer DT990's 600 ohm (price was a steal on amazon.com). I want to do changes in the cMoy so that I can drive these badass headphones at good quality and volume. I am going to put in 2 9V (rechargeable) battereis so that i can pull 18V. What are some other things I can do to better drive these headphones. Changing the opamp or C1 to higher power capacitor? Looking forward to hearing from experienced DIY'ers! I plan on using the cMoy to be mobile within my house. 

 

[Groundloop]

Try NJM4556AD(D) OpAmp. 

 

[Willakan]

The opamp recommended above is excellent for directly driving headphones, but its power requirements make it somewhat unsuited to single 9V battery Cmoys. As you are using two batteries, not a problem!

 

[ijchan223]

I am not sure what cap comes on the board, but in general the larger it is the less static noise.