Are you using single or dual supplies for the op amps? You said the
output is 0.1V to 0.5V. I assumed this was the differential voltage. What is
the voltage of the sensor at one leg of the bridge? At the other? It might
be possible that this voltage is very close to the negative supply. What
kind of pressure sensor are we talking about?

-Phil



> -----Original Message-----
> From: A.J. Tufgar [mailto:tufgaraj@MUSS.CIS.MCMASTER.CA]
> Sent: Wednesday, July 17, 2002 2:09 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Suitable op-amp bridge amp.
>
>
> Thanks Phil,
>             I tried this design, but if doesn't seem to work with my
> sensor.  It centers around 42mV, but when I apply a slight
> pressure the
> output drops to about 40 mV then if I apply alittle more it jumps to
> like 200mV.  No idea why.
>
> Aaron
>
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