Subtractor Op Amp Circuit. Op amp is used to design a circuit whose output is the sum of several input signals. To study op amp as adder and subtractor circuit aic practical.
It is also called as difference amplifier. Such a circuit is called a summing amplifier or a summer or adder. If the input resistors are unequal then the output voltage is a weighted sum and becomes.
Determine the starting value of r1 and r2.
Then we have a general expression for overall voltage gain of the instrumentation amplifier circuit as. The subtraction of the two input voltages is possible with the help of subtractor. If the input resistors are equal in value r 1 r 2 r then the summed output voltage is as given and the gain is 1. The input signals applied are v1 and v2.
