Adder Circuit Using Op Amp Experiment. Sometimes we need a summing circuit to just add together two or more voltage signals without any amplification. Op amp is used to design a circuit whose output is the sum of several input signals.
If the input resistors are unequal then the output voltage is a weighted sum and becomes. By putting all of the resistances of the circuit above to the same value r the op amp will have a voltage gain of unity and an output voltage equal to the direct sum of all the input voltages as shown. Let us assume currents i1 and i2 are flowing through resistances r1 and r2 respectively.
Sometimes we need a summing circuit to just add together two or more voltage signals without any amplification.
Op amp is used to design a circuit whose output is the sum of several input signals. In this configuration an op amp produces an output potential relative to circuit ground that is typically hundreds of thousands of times larger than the potential difference between its input terminals. Thus by kcl at inverting terminal we get. Inverting adder summing amplifier.
