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Why VS1 5V source is connected parallel to VS3 and VS4 in above simulation, that voltage source is not actually connected to any components but why are using.
I don't see a purpose for the 5V that is jumpered to nowhere in the simulation. It's possible it was left in there when the engineer that created this was using it for purposes of testing out and maybe forgot to remove it. Sorry I don't have a better answer but it doesn't appear to be needed in the simulation for the circuit to function.
