There is a summing amplifier with two AC power sources (v1+v2,) each connected to a different Ground. Each of these sources connect to a resistor (R1+R2,) and then to a summing point, which branches off.
One branch leads to the inverting (-) input of an Op-Amp (with the non-inverting (+) input connected to a 3rd Ground.) The other passes through a feedback resistor "Rf1" before connecting, along with the output of the Op-Amp, to point Vx.
The circuit then continues from point Vx (through a resistor Rc) to a second summing point, which also branches off. One of these branches leads to the inverting input of a second Op-Amp (with the non-inverting input connected to a 4th Ground,) and the other passes through a second feedback resistor (Rf2) to meet the output of the second Op-Amp at another point. This point then continues on to V0.
I know that R1 is 1.8kOhms, Rc is 2kOhms, and Rf2 is 6kOhms.
Supposedly the operation of this circuit is v0= 3v1 + 1.5v2, but I don't know what that means.
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