Tony Matthews wrote:
>
> Martin Larran wrote:
> >
> > Hi people!
> >
> >         Here is my problem: I4m using the 16C71 with the four A/D chanels to
> >  measure magnetic field, temperature, etc. The supply is 5V and also the
> > ref.
> > for the A/D. As I use a symethrical(12,-12) PS for the Op. Amp. of the
> > sensors,
> > if something goes wrong with some sensor(like wire breaks), the Op.Amp
> > will
> > saturate blowing the A/D. So which is the best way to prevent this?
> >         For now I4m using another Op. Amp.(Av=1) with single supply of 5V,
 to
> > cut
> > the "overvoltage" but I loose many mV.
> >         Sure there is another simpler and more efficient way of doing it!
> >
> >         Thanks a lot
> >
> >                                                         Martin Larran
> Hi just wondering why you do not use a diode or diodes in parallel with
> the feedback resistor to clip the swing at n*.7v or did I miss something
>                 Tony M.
> --
> ***Disclaimer*** (stolen) My advice and/or opinions: are frequently
> wrong and maybe hazardous to health and/or property; are my own, and
> in no way represent my employer, friends or family; and may be illegal
> and/or immoral in some countries.
hi?
if You want protect Your PIC use a diodes.This is a soft limiter & You
are dont lose Your mv(oltes).Be aware !! Diode is capacitor.
        Best regards
                Saras.