Hi Group
Im trying to hoook 2 straingauges up to INA125 Instrument Amps.
Got the parts ordered, but Im having difficulties with the schematics.
I will need both Positive and negative strain from my 120 ohm straingauges.
The straingauges will vary from 119.8 Ohm to 120.2 ohm so I need a Whetstonebridge.
With the right gain from the INA125 this will give me a voltage( that my Arduino can read the easy part) from 0V to 5 V.
But how do I hook this up? Nomatter how look at it I will need a negative power supply also for the INA125.
Am I missing something?
If anyone has a schematics it will be highly appreciated. Im Mechanical, not Electrical.
These days negative supplies are seldom used, you just set up a mid-rail virtual ground
for the analog reference, usually there's a spare opamp in the package you can use to
do this (you buffer a resistive divider with an opamp to provide a stiff virtual ground).
If you're working with high-grade audio you might want dual rails, but for mixed analog/digital
its rare.
