Summing AmplifierΒΆ

Operational amplifiers can be used for simulating mathematical operations like addition, integration, differentiation etc.

Objective

Make a summing amplifier using an Op-Amp and test it.

Procedure

_images/opamp-summing.svg
  • Make the circuit on bread board, as shown. Use 1k\Omega for all resistors
  • Set PV1 and PV2 to 1V each
  • Enable A1, A2 and A3
  • Observe the outputs. Verify that the output is the sum of inputs

The output is given by V_{o}= \frac{R1}{Rf}V1 + \frac{R2}{Rf}V2 + ...

Discussion The summation can be done using AC waveforms also. Our supply voltage is only 6V. So the output should be kept less than 4V.

  • Replace R1 with 10k\Omega and feed SQ1 instead of PV1