This is a Sallen-Key Low-pass Filter. Use this equations to calculate the Transfer Function for filter at a given frequency or values of R and C. use any Op Amp for assembling the circuit. I have given below some most common op amps pinouts for your convenience.
>> Calculate the transfer function for Sallen-Key low-pass filter with R and C values
>> Calculate the R and C values for the Sallen-Key low-pass filter at a given frequency
Note : Use R as Ohms (Ω) and C as farads (F), then Fc will be hertz (Hz).
See below for frequency response of above filter that designed for 20 KHz cutoff frequency.
R1 = 8.2kΩ
R2 = 8.2kΩ
C1 = 0.001uF
C2 = 0.001uF
Cut-off frequency fc = 19409.1394015 Hz = 20KHz
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