Excellent point, although I must admit that "STRAIN" is a terminology I have
not been exposed to.  The non-inverting configuration for many video op-amps
require a gain of at least 10.

----- Original Message -----
From: "Shawn Wilton" <shawn@BLACK9.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, June 11, 2004 1:58 PM
Subject: Re: [EE] OPAMP use


> The only thing that should concern you regarding strain would be that if
> you drop your gain too low then the amp will no longer be stable as it's
> receiving positive feeback instead of negative feedback and as a result
> the amp will receive too much positive feedback (goes to infinity) and
> you will eventually have a situation where it is being pushed too hard
> and will fail.
>
> This can be ovserved in the bode plots for the gain of the amp.  It has
> to do with the gain and the phase at which it occurs.  You would be wise
> to construct a simple bode of the magnitude and phase and look at
> whether or not the gain comes back to less than one before it hits 180*.
>   If not, then you will at least know what minimum gain is required for
> stable operation.
>
> -Shawn
>
>
>
> Luis Moreira wrote:
>
> > exactly my question.
> >
> > -----Original Message-----
> > From: David VanHorn [mailto:dvanhorn@CEDAR.NET]
> > Sent: 11 June 2004 15:34
> > To: PICLIST@mitvma.mit.edu
> > Subject: Re: [EE] OPAMP use
> >
> >
> >
> >>I read a few things about it and it seems that the non inverting
> >>configuration puts more strain on the OPAMP...
> >
> >
> > Strain?  In what way?
> >
> > --
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