Not sure the statement near the beginning about the even resistors being equal and the odd resistors being equal is correct. The circuit will produce the expected results as long as the ratio R1/R2 is the same as the ratio R3/R4, which you can satisfy without R1 = R3 and R2 = R4. If my algebra is correct, as long as R1/R2 = R3/R4, the circuit will calculate the difference between the inputs, with a gain of R2/R1.
In the description with positive input -3V and negative input -4V. The positive input has the higher voltage. -3V > -4V. And therefore the output is +1V
I don't quite understand what you mean by them. But if I understood correctly, that's because the feedback goes to negative input. The input voltages are constant so only the output can regulate the voltages
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WOW... that was a clear explaination!!! Great Video!!
Best explanations I’ve ever heard Thanks!
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Great videos sir,
Could you do a video on a two transistors diff amp? Thanks!
Not sure the statement near the beginning about the even resistors being equal and the odd resistors being equal is correct. The circuit will produce the expected results as long as the ratio R1/R2 is the same as the ratio R3/R4, which you can satisfy without R1 = R3 and R2 = R4. If my algebra is correct, as long as R1/R2 = R3/R4, the circuit will calculate the difference between the inputs, with a gain of R2/R1.
what reference of input voltage to make it +4V +3V??
In the description with positive input -3V and negative input -4V.
The positive input has the higher voltage.
-3V > -4V. And therefore the output is +1V
Why opamp is trying to make them equal with non inverter input as a reference and not the inverter's one? Am comfused
I don't quite understand what you mean by them.
But if I understood correctly, that's because the feedback goes to negative input.
The input voltages are constant so only the output can regulate the voltages