[sdiy] You all missed my arp omni chronicles..

[Harry Bissell Jr]

  A guy
> in AH suggested 
> that there are some op amps which actually in a
> buffer ap will invert 
> the output when you hit rail!  

Phase reversal.  Some opamps (esp. some Linear Tech)
say right on the data sheet "no phase reversal"

I had this with OP-07 (no phase reversal) and OP-77
(phase reversal). Imagine what this did to a
temperature control servo loop. "oops I'm to hot I
better turn the heat up EVEN MORE !!!"   :^P


I had already tried a
> 4558 also and this 
> was the case.  The 1458 is the only amp that works
> in that particular 
> type of applications of the three!  Nice...to know
> that! :)

I have never seen the 4558 phase reverse. I'll be
watching for that.

H^) harry