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can someone please show me how to calculate the output voltage of this circuit or give the required formula/s to perform the necessary calculation. All help will be appreciated. [simulated output ≈ 99µV ]
But the input to the capacitor of the lowpass filter is not zero impedance. It varies with the setting of the pot. It must be fed from the output of a buffer opamp to use the simple calculation for a highpass filter. Maybe the pot should be at the input of the opamp you show.actually the 3v is the output of an opamp
Vo=(Vin*w^2*R7b*C2*C3*R8)/(sqrt((-w^2*R7b*C2*C3*R8-w^2*R7a*C2*C3*R8-w^2*R7a*R7b*C2*C3+1)^2+(w*C3*R8+w*R7b*C3+w*R7b*C2+w*R7a*C2)^2))
If you do not want to assume that the 10uf cap passes all frequencies of interest, then you'll have to use the more complicated formula which also includes C2:
Note that the small cap 0.001uf dominates so the simpler formula is good down to around 10Hz or a little lower. Lower than that the amplitude gets pretty small anyway though.Code:Vo=(Vin*w^2*R7b*C2*C3*R8)/(sqrt((-w^2*R7b*C2*C3*R8-w^2*R7a*C2*C3*R8-w^2*R7a*R7b*C2*C3+1)^2+(w*C3*R8+w*R7b*C3+w*R7b*C2+w*R7a*C2)^2))
Oh yeah, one more little thing...
You may want to put Vin back in the numerator as that seemed to get lost somehow.
Hello there,
You can substitute R7b with 10000-R7a so you only have to set R7a (the upper part of the pot).
How do i go about setting a value for the upper part of the pot. Is there a range of values to choose from is it specific.