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Difference Amplifier (Subtractor) - 14180_127
Difference Amplifier (Subtractor) - 14180_129

Neets Module 08-Introduction to Amplifiers
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3-40 Then, for a difference amplifier: With the same inputs that were used for the subtractor, (E1 = + 3 V; E2 = + 12 V) the output of the difference amplifier should be five times the output of the subtractor (Eout = + 45 V). Following the same steps used for the subtractor: First compute the value of R2 plus R4: With this value, compute the current through R2 (IR2): Next, compute the voltage drop across R2 (ER2): Then, compute the voltage at point B: Since point A and point B will be at the same potential in an operational amplifier:






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