Mosaic
Well-Known Member
Hi,
I am trying to build an opamp circuit (mc34071) to offset an auto battery's voltage by 12.4V downward so that the output of the opamp reads 0 when it sees 12.4V from the battery. Therefore 12.7V should translate to 0.3V output on the opamp!
If rail to rail is a prob...I can work with perhaps everything offset up by up to .2 V.
So perhaps 12.7V could translate to 0.5 V from the op amp, and 13.2V could be 1V.
I am using a 4.096 precision source divided toa 1.024V precision source on a 16F886 Vref+. I'll use an adc with the full 10 bit 1.024V range to precisely measure the voltage.
Any advice?
I am trying to build an opamp circuit (mc34071) to offset an auto battery's voltage by 12.4V downward so that the output of the opamp reads 0 when it sees 12.4V from the battery. Therefore 12.7V should translate to 0.3V output on the opamp!
If rail to rail is a prob...I can work with perhaps everything offset up by up to .2 V.
So perhaps 12.7V could translate to 0.5 V from the op amp, and 13.2V could be 1V.
I am using a 4.096 precision source divided toa 1.024V precision source on a 16F886 Vref+. I'll use an adc with the full 10 bit 1.024V range to precisely measure the voltage.
Any advice?