Butterworth filter – the frequency response of this type of filter is also known as the maximally flat (no ripple) response because the passband is designed to have a frequency response which is as flat as mathematically possible in the cutoff frequency range.
Low pass Butterworth filter
The filter is essential to the operation of most electronic circuits. The filter is a device or process that removes unwanted components of features from a transmitted signal most of then this means removing some frequencies and not other to suppress interfering signals and reduce background noise.
What is a Butterworth – filter
The Butterworth filter is a type of signal processing filter design to how much US flight frequency response as possible no ripples. In the passband and zero roles of response in the stop band. Butterworth filters for one of the most commonly used digital filters in motion analysis and in the audio circuits.
They are fast and simple to use. since they are frequency based on the effect of filtering can be easily understood and predicted.
Low pass Butterworth-filter calculation
Low pass filter will be used to remove all the high order frequencies, up to 10.25 khz from the input signal. The equation is used to calculate capacitor value for the low pass filter side.
CK = Dk/m*2*Ï€*FC
- Where k is equal to the order number.
- Ft is equal to cut off a frequency that is equal to 10. 25 kiloHertz
- M is equal to magnitude efficient equal to r equal to 10 kilo-ohms (standard audio resistance value from 10-kilo ohm to 1 megaohm)
- DK equal to normalized capacitor value.
The required components or parts
- LF 411 CN operational amplifier
- Audio input Jack
- 0.01 microfarad capacitor
- 1 kilo ohm resistor
The capacitor value return calculated by using the formula.
1.753 /10k*2*Ï€*10.25
- C1 equal to 3nf
- C2 equal to 2nf
- C3 equal to 680nf
- C4 equal to 5 nf
