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This summing amp is not a great example - if you disconnect one of the inputs, the signal amplitude on the non-inverting op-amp pin doubles. Also, the op-amp gain is 2 so therefore your signal will double in size. Try using a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gifenter image description here

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

This summing amp is not a great example - if you disconnect one of the inputs, the signal amplitude on the non-inverting op-amp pin doubles. Also, the op-amp gain is 2 so therefore your signal will double in size. Try using a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gif

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

This summing amp is not a great example - if you disconnect one of the inputs, the signal amplitude on the non-inverting op-amp pin doubles. Also, the op-amp gain is 2 so therefore your signal will double in size. Try using a better summing amp: -

enter image description here

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

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Andy aka
Andy aka
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This summing amp is not a great example - if you disconnect one of the inputs (not used), the signal amplitude on the non-inverting op-amp pin doubles. TheAlso, the op-amp gain is 2 so therefore your signal doubleswill double in size. Try connecting the unused pin to 0V or useusing a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gif

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

This summing amp is not a great example - if you disconnect one of the inputs (not used), the signal amplitude on the non-inverting op-amp pin doubles. The op-amp gain is 2 so therefore your signal doubles in size. Try connecting the unused pin to 0V or use a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gif

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

This summing amp is not a great example - if you disconnect one of the inputs, the signal amplitude on the non-inverting op-amp pin doubles. Also, the op-amp gain is 2 so therefore your signal will double in size. Try using a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gif

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.

Source Link
Andy aka
Andy aka
  • 472.9k
  • 29
  • 383
  • 839

This summing amp is not a great example - if you disconnect one of the inputs (not used), the signal amplitude on the non-inverting op-amp pin doubles. The op-amp gain is 2 so therefore your signal doubles in size. Try connecting the unused pin to 0V or use a better summing amp: -

http://users.cecs.anu.edu.au/%7EMatthew.James/engn2211-2002/notes/ampsimg71.gif

This uses a virtual earth for the currents to sum from each input and disconnecting one of the inputs does not cause the gain to change.