Got another shipment of various opamps and other ICs today including a few BUF634s. I hooked one into the power supply and it improved the circuit dramatically. The VGnd rail is now closer to dead center and doesn't waver as much as before.I also got a few OPA2227P's and OPA2228P's. I believe the 2228 is for a gain >5. I don't think this amp has a gain >5 (can someone verify?). The 2227's seem to be working fine. The amp seems less harsh at high volumes with this opamp compared with the 2132, but that could just be my own wishful listening.
As for putting BUF634s between each channel output and my headphones, I've read that this could cause a DC offset voltage going into my headphones (very bad for them). See this posting on using the BUF634 in a cmoy. Would it be possible to achieve the same results putting the buffer between IC1b and R4 as in the photo below?
I'm not worried about power consumption, I plan on using this amp at my desk only. It seems to work well off of a 15V wall wart that I have that can supply up to 900mA. The voltage ripple doesn't seem to cause this amp to oscillate like it did in my old CMoy.
[Edited by elconcho on 06-30-2003 at 07:17 PM.]
posted 06-30-2003 02:07 PM CST (US) 
