Hi,
A true differential amplifier circuit needs equal conditions on inverting and non inverting side.
But yours is unsymmetric.
The capacitor at the input side and the 50k feedback...
Make it symmetric before next simulation.
Klaus
The solution was already given in one of your last threads. Review post #8 of that thread and see that feedback resistors have the same values.May i get the solution ?
The design of the 741 opamp you are using is 50 years old! It was one of the first opamps and its input resistance is only 300k ohms minimum. For your circuit to have 1M resistors as passive filters then you need a modern opamp that has extremely high input resistance.
It is too bad that your schematic has a grey background with a crosshatch grid and almost every wire crosses over other wires instead of being straight. Is it Multisim that has <TEXT>, <TEXT>, and <TEXT> and the other problems all over it?
Sorry i didnt get you ,the said post saying about burda desisyon eeThe solution was already given in one of your last threads. Review post #8 of that thread and see that feedback resistors have the same values.
https://www.edaboard.com/showthread.php?t=374236
The burden resistor is the floating voltage source in the schematic of this thread.Sorry i didnt get you ,the said post saying about burda desisyon ee
I notice that the circuit attenuates the high AC input voltage, and does not amplify it. Then the old opamp with the fairly low input resistance will work fine.
I agree that its inputs should be symmetrical and balanced.
Are you sure?I am using Proteus ,i plan to use lm358 instead of 741 but unfortunately ,lm358 model is not available in Proteus.
My supply voltage is 12 voltThe old 741 opamp was designed to use only a 30V (plus and minus 15V) supply. Your schematic does not show a supply voltage. What is your supply voltage for the opamp?
The LM258 works with a supply voltage as low as 3V.
Are you sure?
What is the meaning symmetry ,In both terminals have same resistor ?Hi,
Without symmetric resistor values ... it my work in simulation, because your simulation doesn't care about common mode (AC) voltage.
Don't be surprised if your circuit doesn't work satifactory in real word.
Klaus
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