No, gain is *2. That's 6dBgain of 2dB
You need to swap the values of R3 and R4. If you set R3=10K, R4=20K, it works fine.
No, gain is *2. That's 6dB
BTW, it would be better to put the U3 inverting gain stage in front of the filter stages, instead of after them. That will give constant input impedance vs frequency.
My simulation of your circuit with the corrected values gave the correct response, with 6dB gain. If you want 2dB, that's a gain of *1.259 so in your circuit, R6 must be = 1.259 * R5.
I don't know why your simulation only shows about 4.2dB gain. The response shape looks like it might be correct, but you're only showing it between 200Hz and 3KHz. When you run the simulation, set the frequency range to 10Hz - 100KHz. That will give you a good picture.
You're only showing the response between 200Hz and 3KHz again. As I wrote before: "When you run the simulation, set the frequency range to 10Hz - 100KHz. That will give you a good picture".
You almost got it right in post 5. There you showed 100Hz - 100KHz.
You're only showing the response between 200Hz and 3KHz again. As I wrote before: "When you run the simulation, set the frequency range to 10Hz - 100KHz. That will give you a good picture".
You almost got it right in post 5. There you showed 100Hz - 100KHz.
Are you going to actually build this circuit, or is it only a simulation for learning purposes?
If you are actuallly building the circuit, I would suggest to change the LM741 opamp for something more modern.
The LM741 has a terribly slow slew rate specification, and I doubt that it will be able to pass a 10Khz signal (if it is higher than a few hundred millivolts) without distortion.
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