non-NFB buffer

[vizion]

hello,

has someone come across a buffer with no NFB ?

thanks.

 

[Chucko]

Does an emitter/source/cathode follower meet your "no NFB" criteria?

 

[vizion]

it's something to hop on. do you have the details ? isn't there usually global feedback with that combo ?

 

[Leolabs]

JFET follower loaded with JFET current source.

 

[vizion]

Leolabs,


do you have schematics or a link ?

 

[mlloyd1]

search for the Hafler 915 preamp manual at the Hafler web site.
also, numerous links on this site via search function.

mlloyd1

Leolabs,


do you have schematics or a link ?

 

[CBS240]

Q1 is a Jfet follower and is biased with a constant current because R4 will always have Vbe of Q3, or 0.6V across it. P1 sets DC bias, Q2 is the self bias J-fet CCS. Regulated PSU is a must. Just a quick thought.😉

 

[Charles Hansen]

has someone come across a buffer with no NFB ?

If you're looking for a ready made (chip) solution, here are a few:

National LMH6321
Burr-Brown BUF634
Burr-Brown BUF600/601 (discontinued, but still in stock at some distributors)
Maxim MAX4200 through MAX4205

Or you can roll your own.

 

[vizion]

Larocco Audio used to carry a dynamically biasing triad diamond buffer with no global feedback. not in production anymore