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is it possible to have a subtractor circuit with a low pass filter in it? My thought is that I would have the possibility of doing that if I add a capacitor in parallel with R3. Is it actually possible? If not, whats the best way of doing it?

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  • \$\begingroup\$ What about finding the transfer functions for the various alternatives and compare it with the genral lowpass function? \$\endgroup\$ – LvW Apr 2 at 9:31
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Yes. I have done this before. You put two capacitors in; one across R3 and one across R4. But remember the impedance at the noninverting input is not the same as the inverting. I will leave it to you to determine what they are, especially as you have not given any values.

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