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Asked by anki - 2 years ago
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AncientHacker Level 12
Answered 2 years ago
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Your basic op amp needs 5 pins-- 2 inputs, 1 output, and plus and minus power.

That's 5 pins.

Some op-amps, mostly the older ones, have two more pins for nulling out the input offset voltage, which was considerable on those older op-amps.

On the 741, in the 8-pin DIP package, pins 1 and 5 are the offset null pins. They're either left unconnected, or connected to an offset null potentiometer. You can't do anything else with them, like connect them to ground.

Pin 8 is "NC", which depending which data sheet you look at means "NO CONNECTION-- do not use", or "NOT CONNECTED TO ANYTHING".
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