Best buffer for a chipamp?
 

Hi all,

I am planning to make an unity gain stage to use for my chipamps (LM3886, LM4780 and LM3875).
Whats the best sounding buffer design?
Should I use a discrete design (i.e. Pedja Rogics JFET buffer)?
Or may I use just an OPA134 in unity gain? (I dont know if it sounds good at unity gain)
Or do you advice a better alternative?

Thanks in advance for your replies.

waiting too

Don't wait - read ! ;)

go with Pedja Rogic's FET buffer.

I havn't tried the Pedja Rogic fet buffer, but i can tell that opamps at unity gain do sound bad.

I can't decide between Pedja's buffer and AD797 in unity gain - they are both extremely good - and if you want to drive low Z headphones too, or very long cables - go for JISBOS.

Finally I have decided to make Pedja's.. And finished in one weekend :D
http://img136.imageshack.us/img136/9...oto0010he7.jpg
http://img120.imageshack.us/img120/7858/pedjaap9.png
Now its ready for departured! But I have a problem with the power supply. Which is;
http://www.diyaudio.com/forums/showt...hreadid=124548
I havent got any replies from Power Supply Design guys until now. May you say something? Because I am growing impatient to try my JFET buffered gainclone...

get a 20-0, 20-0Vac transformer and you won't need a regulator/s

Or replace the 1083 regs with another pair of 317/337 to see if that cures the problem.

But Pedja advices regulated supply in his web site...

Hmm... With 30v supplies, one LM3875 sink more than 3.5A, in this case, do you think 317/337 will enough, especially if you take consider my speakers sensivity is just 86dB!