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i need a low pass filter
angelescalonabueno

angelescalonabueno

@copilot i need a low pass filter
2y

copilot

It seems like you've already set up the components for a 2-stage low-pass filter with a cutoff frequency of approximately 100Hz. The operational amplifiers (U1 and U2), resistors (R1 and R2), and capacitors (C3 and C2) can be used to make a second-order (2-stage) active low-pass filter using Sallen-Key topology.
Here are the connections:
  1. Connect R1:P1 to the signal input (this can be J1:TIP based on your netlist).
  2. Connect R1:P2 to U1:+IN and C3:P1.
  3. Connect C3:P2 to Ground (net 0 as per your netlist).
  4. Connect U1:-IN to R2:P1 and U1:OUT.
  5. Connect U1:V+ to your positive power supply (Net 2) and U1:V- to your negative power supply or Ground (Net 0).
  6. Connect R2:P2 to U2:+IN and C2:P1.
  7. Connect C2:P2 to Ground (Net 0).
  8. Connect U2:-IN to U2:OUT and take your filtered signal from U2:OUT.
  9. Connect U2:V+ to your positive power supply (Net 2) and U2:V- to your negative power supply or Ground (Net 0).
This will give you a 2-stage (second-order) low-pass filter with a cutoff frequency of approximately 100Hz. The exact cutoff frequency is determined by the resistors and capacitors:
fc=1/2∗pi∗sqrtR1∗R2∗C1∗C2f_c = 1/{2*pi*sqrt{R1*R2*C1*C2} }
where:
  • $R1$ and $R2$ are your resistor values (5 kOhm)
  • $C1$ and $C2$ are your capacitance values (318 nF)
Source(s):
https://docs.flux.ai/reference/expressions-overview https://docs.flux.ai/introduction
2y
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3
R1
Resistance
5kΩ
U1
End of Life
R2
Resistance
5kΩ
C2
Capacitance
318nF
C3
Capacitance
318nF
U2
End of Life
X1
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2-stage 100Hz lowpass filter

2-stage 100Hz lowpass filter thumbnail
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