Hi,
You don't need to add DC voltage to the 3 pin op amp. There are fixed voltage for this.
+ Vp = 20 ; fixed internal supply for 3 pin devices.
+ Vn = -20 ; fixed internal supply for 3 pin devices.
If you need other voltage, please use 5 pins op amp .
There is a 3 pin Opamp example for you <https://easyeda.com/editor#id=8yGcICwNH>
Hope this works.
Dillon
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