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I greet everyone in the community,

I have a sample circuit like this

enter image description here

and this is how I simulate it.

enter image description here

theoretically X and B values on paper; X = 1.5 VOLT B = 3 VOLT as But in the simulation I find the X value close, but the B value very wrong. When I connect 14V, - 14V to port 7 and 4, I find the correct value.

The problem is this:

why do I see the correct values when I connect 14V, -14V to ports 7 and 4? so what is the difference between connecting something to ports 7 and 4 and not connecting something to ports 7 and 4?

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1 Answer 1

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Pin 4 and pin 7 is power to the opamp. Without them it dont work.

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  • \$\begingroup\$ I understand that on paper, i.e. theoretically, the 7 and 4 pin connection is not important, but in practice it is important, right? \$\endgroup\$ Commented Jul 7 at 7:50
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    \$\begingroup\$ Yes on paper you don’t need to connect power to an opamp 😉 in practice very important. If you don’t add power then how to expect it to amplify. You would be generating energy. \$\endgroup\$
    – Tyassin
    Commented Jul 7 at 7:51

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