Butterworth Low Pass Filter

Butterworth filter is a kind of electronic filter, it is also called maximum flat filter. The characteristic of the Butterworth filter is that the frequency response curve in the passband is as flat as possible without ripples, and it gradually drops to zero in the stopband.
A low pass filter is a filter that passes low frequency signals but attenuates signals with frequencies above the cutoff frequency. Enter the cutoff frequency value, any resistor or capacitor value, any resistor Rc or resistor Rd, and click Calculate.