[sdiy] Non-inverting output buffer

[Harry Bissell]

at risk of sounding (or being) stupid...

R1 and the capacitor will form a low pass filter that will
change the transient response... if R1 is too big.  I'd suppose that
values from 1K - 10K would be fine here.  R1 should be much smaller
than the input impedance of the buffer, I'm assuming a TL07x series
which has such a high input impedance it hardly matters.

Maybe more from the maths-heads

H^) harry


----- Original Message -----
From: Andre Majorel <aym-htnys at teaser.fr>
To: synth-diy at dropmix.xs4all.nl
Sent: Tue, 27 Apr 2010 11:18:07 -0400 (EDT)
Subject: [sdiy] Non-inverting output buffer

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/
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-- 
Harry Bissell & Nora Abdullah 4eva