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I'm having problem understanding the output of the integrating op amp.

https://www.dropbox.com/s/djpg0uhi465ot86/download2.png

https://www.dropbox.com/s/djpg0uhi465ot86/download2.png

https://www.dropbox.com/s/p9bp9tlyykhjtvf/download.png

https://www.dropbox.com/s/p9bp9tlyykhjtvf/download.png

(hope you can see that, I can't see it on my preview)

The blue line is input, orange is output. So if it's supposed to integrate, surely output signal has a wrong sign, doesn't it? If the integral is the area under the square signal, there should be linear increase when the signal is positive and linear decrease when it's negative, yet it's the other way around, why? I'd thought it was because my voltage had been applied to the inverting input of the op-amp, but even when I flipped it, it stays the same...

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# Integrating op amp question

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