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pressure sensor

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Maybe something like this? What you are asking is pretty generic in nature. The link covers a pressure sensor that has some degree of onboard signal conditioning and is temperature compensated. Honeywell also makes a variety of sensors that could likely be used as well as other manufacturers.

You really need to be a little more specific.

Ron
 
Probably he wants an instrumentation amplifier for the sensors like the one always mentioned by Audioguru: AD620. It looks pretty good. :)
Otherwise, I've got a friend who uses a Wheatstone bridge and amplified the output using precision op-amps for blood pressure detection. Pretty simple, and very cheap as well. That is if he uses the generic transducers like in hospitals. :D
 
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