Did you see post #11? The inputs are diff amplitudes but same phase, the gain is 21, the output is amplified with same phase. My circuit I made on breadboard outputs zero amplitude at zero phase but increases with increase in phase on the generator.
Where is the 90° coming from? What are you referring to?I checked the circuit again and I got the amplified signal I expected, but now the problem is when I have V2 = 3V pk-pk and V1 = 2.6V pk-pk and vice-versa there is no 90 deg phase shift and both are inverted.
by Jake Hertz
by Aaron Carman
by Jake Hertz