The low pass filter only allows low frequency signals from 0Hz to its cut-off frequency, ƒc point to pass while blocking those any higher.
fc = 1/(2πRC)
fc = 1000 Hz
R=470
C=1/(2πRFc) = 1/(2π*1000*470) = 0.39 μF
To create a low pass filter with a frequency cutoff of 1000 Hz, we can use the following formula to determine our capacitor value based on the chosen resistance.
R=47
fc=1000
fc = 1/(2πRC)R=1K
C=1/(2πRFc) = 1/(2π*1000*100047) = 0 3.159 3 μF
R=10k
C=1/(2πRFc) = 1/(2π*10000*1000) = 15.9 nF
R=47K
C=1/(2πRFc) = 1/(2π*1000*47000) = 3.39 nFhttp://www.learningaboutelectronics.com/Articles/Low-pass-filter-calculator.php#answer1