At 11:19 AM 5/10/2010, Olin Lathrop wrote:

>Also just removing R9 won't make a unit gain stage, but a oscillator.  TL072
>are not unity gain stable, despite what some sources claim.

Hmm - this looks wrong.  I've been using TL07x as unity gain buffers 
for decades now.

Just looking now: TI's data sheet 
<http://focus.ti.com/lit/ds/symlink/tl071.pdf> says that the chips 
are unity-gain stable.  See page 9 of the PDF file I referenced above.

dwayne

-- 
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

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