Hi,

I've made up a load cell of sorts with two active 350 ohm strain gauges, on=
e
in tension and the other in compression, and a couple of dummy gauges to
complete the bridge.

I'm looking at making an amplifier for this.  My stress calcs show that I
will need about a gain of 800 to produce a 4V output signal.  Loads will be
static.

I've seen designs for both the AMP04 amplifier
http://dkc3.digikey.com/us/images/datasheet.gif

and the INA125 amplifier http://www.ti.com/lit/ds/symlink/ina125.pdf

This is for a 1 off device for personal use and will be battery powered.

The AMP04 is more expensive at $10.70   while the INA125 is $6.25.  Spec
wise they look similar to my untrained eye.  Is there any reason that I
shouldn't go for the cheaper amp?  Any gotchas that I should know about?

Regards,

Gordon Williams


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