Best buffer for a chipamp?

[Dxvideo]

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.

[sneih]

waiting too

[Nuuk]

Don't wait - read !

[AndrewT]

go with Pedja Rogic's FET buffer.

[ionomolo]

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

[juma]

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.

[Dxvideo]

Finally I have decided to make Pedja's.. And finished in one weekend


Now its ready for departured! But I have a problem with the power supply. Which is;
Problem with LT1083 PSU...
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...

[AndrewT]

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

[Nuuk]

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

[Dxvideo]

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

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

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

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!