Hello,

I am trying to design a circuit but one small aspect is holding me back.

I have two signals, we will call them A and B.

I want signal A to always appear at the output

I want signal B to be subtracted from signal A if they are common

But what I dont want is signal B at the output. That sensor is there to pickup vibration and cannot be at the output for instance if it raises to a higher peak to peak voltage or has different information then sensor A.

So it is like a difference amp, except one input is there for subtraction only.

Signal A has varying DC offset as it is a Load Cell, it is the superimposed AC signal due to vibrations I am looking at.

How is this achieved, I have been thinking about it for an hour now.



Thank you for any suggestions.