Simple OP-AMP circuits
two R2 resistors differ by 1% you're difference will be off by 1%. Same goes for the R1 resistors. Assume V1 = V2. If the resistors aren't matched the output won't be zero. Actually, it's better to buy a difference amplifier or an instrumentation amplifier instead of building the difference amp from an op-amp and discreate resistors.
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