Op Amp Adder Circuit Diagram. For information on the basics of op amp read operational amplifier basics. Since input current to the op amp is zero the two currents are added to get current i which flows through the feedback resistance rf.
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Thus by kcl at inverting terminal we get. If the inputs resistors r 1 r 2 r 3 etc are all equal a unity gain inverting adder will be made. For example if rf is 100 kilo ohm and r1 is 10 kilo ohm then the gain would be 100 10 10 if the i p voltage is 2 5v the o p voltage would be 2 5 10 25.
If the input resistors are unequal then the output voltage is a weighted.
Op amp is used to design a circuit whose output is the sum of several input signals. If the inputs resistors r 1 r 2 r 3 etc are all equal a unity gain inverting adder will be made. Thus by kcl at inverting terminal we get. According to the virtual short concept the voltage at the inverting input terminal of an op amp is same as that of the voltage at its non inverting input terminal.
