Hi,
I see you had changed that 500k to 10k, but that's still not right.
I'll talk about this one more time.
Change R2 and R4 to 10k each.
Ground the right side of R11.
Connect the left side of R11 to the non inverting input of the right side op amp, remove R8.
Note i had updated this post recently because i mistakenly had shown R2 and R4 to be 5k each when really they need to be 10k each.
Testing:
With 1vdc in the top and 1v in the bottom you should see a very small output voltage, in the millivolts or a couple tens of millivolts. Ditto for -1v and -1v.
With 1v in the top and -1v in the bottom, you should see roughly -1v on the output.
With -1v in the top and 1v in the bottom you should see roughly 1v on the output.
I see you had changed that 500k to 10k, but that's still not right.
I'll talk about this one more time.
Change R2 and R4 to 10k each.
Ground the right side of R11.
Connect the left side of R11 to the non inverting input of the right side op amp, remove R8.
Note i had updated this post recently because i mistakenly had shown R2 and R4 to be 5k each when really they need to be 10k each.
Testing:
With 1vdc in the top and 1v in the bottom you should see a very small output voltage, in the millivolts or a couple tens of millivolts. Ditto for -1v and -1v.
With 1v in the top and -1v in the bottom, you should see roughly -1v on the output.
With -1v in the top and 1v in the bottom you should see roughly 1v on the output.
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