Different behavior with same op amp with and without power supply

Just bought a license and was trying a simple circuit using an TL081 op amp.

I saw there are 2 options, one without power supply pins and other one with supply pins.

I tried both but the result is different.

Checking the negative input of the op amp I see it works different.

In the last image the amp- and amp+ are overlapped as expected.

Could someone explain why are not both signals equals in the "powered" op amp circuit?


by itzalak2
March 28, 2016


The links in your post are broken.

Please post a link to your schematic.

In the meanwhile, does this thread help?


by signality
March 28, 2016

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