An opamp supply limit in the differential amplifier mode

[hesam_m]

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]

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]

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.

 

[hesam_m]

Yes, I solved the problem. it was because of my mistake in component values, thanks