Beautiful amps guys! I've made a CMOY following your schemes tangent (etched my own PCB) and I have to say that it sounds wonderful. I'm using some modded HD202's (opened them up among other things), plus quite a modded xtrememusic. Nice combo! Anyway, I'd like to build something more powerful which will give me some room to upgrade, since I'll probably upgrade to some HD650s in the future
I live in Argentina so it's difficult for me to find quality components, the only way to get decent opamps, rail splitters, buffers is through TI's free samples program. Right now some TLE2426s and BUF634s are on their way home, takes them three days to get from the USA to down here. I also ordered some OPA827s to try the "FET magic" I keep on reading around here... I already have some OPA1612s, which I've used in my CMOY and my x-fi. Beautiful opamp!
I've been reading your PIMETA schematics and I think it's just complicated enough that I, following the schematics, can turn them into a single layer PCB on my own. (The PPA is too complex for me to design and debug, I won't go that far right now...) This would be my second amp. I think I'll build the v2; but I see that you're using other buffers (the LMH6321, not the BUF634). Can I adapt BUF634s on the opamp outputs instead of the LMH6321, without ill effects on the circuit? If it's not possible, I see the v1 already has them on the schematics, and that'd be the way to go.
I've also read your notes on the V2, and it seems you've tailored it to use FET opamps like the OPA827 instead of bipolar opamps like the OPA1612. Would it be a safe bet to just use the 827s and not even bother with the 1612/pair of 1611s? What do you think? Thanks in advance.Edited by vodkex - 3/31/11 at 9:12pm