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I'm working on 741 op-amp summer circuit. I followed the circuits on google.


I did the circuit both on lab and simulation. But the results aren't as expected, I thought it will sum any voltage and add that to the outptut with setting the gain to be 1.


Here are the circuits I did:


1. Lab:


[ATTACH=full]197983[/ATTACH]


2. Simulation:


[ATTACH=full]197984[/ATTACH]



What I'm doing wrong ?


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