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An opamp supply limit in the differential amplifier mode

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hesam_m

Member
Hi,

I have a sensor which is connected to +12V and it shows some small variations at the output.

I have an opamp which I have configured in AC input, inverting amplifier. therefore I should supply it with the load voltage and then find the best value for + rail (by default the half of the VCC which is 6V), something like the figure below, but the opamp maximum supply is 3.3V. I am bounded to use this opamp and I can not change the sensor voltage.



is there any method to fix this problem?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
You don't mention what opamp you're using?, is it rated for use at 3.3V? (which sounds extremely low), you probably need to find one that will work from such a low voltage.
 

ronsimpson

Well-Known Member
Most Helpful Member
Please recheck the "max Vcc = 3.3v". Maybe the output goes to a micro computer that runs on 3.3v.

If senser lives at 12v and op anp lives at 3.3v, there is no problem. The capacitor removes the DC.
 
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