Hi,


> > > You MAY be able to current sense at lower voltage drops using
> > a long tailed
> > > pair using only two (or possibly three) transistors.
> >
> >     I am not quite sure that I could trust the match between the
> > transistor to form a differential amplifier and get good results
>
> How about a supermatch pair, eg LM394 ?
>
> http://www.national.com/pf/LM/LM394.html

    Those are very expensive parts. It would be cheaper to buy a ready made
current sensor chip !

Best regards,
Alexandre Guimaraes

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