[sdiy] Non-inverting output buffer

[Andre Majorel]

Excuse the basic question, but in a non-inverting output buffer
like this one

                   R1
        +---------^v^v---------+
        |                      |
        +------||----+         |
        |     33pF   |         |
        |  |-_       |         |
        +--|- -_     |   R2    |
           |   _-----+--^v^v---+--o  OUT
  IN  o----|+_-          75
           |-

how do you choose R1 ?

The goal is to have a gain of 1.0000 from DC to 20 kHz for loads
down to 10 k.

-- 
André Majorel http://www.teaser.fr/~amajorel/