This page contains a variety of calculators as an aid in learning about and designing with filter circuits.
It contains a variety of calculators for low pass, high pass, and bass pass filters.
Low Pass Filter Calculators
Main Page: Low Pass Filter Calculators
![A low pass filter blocks frequencies above its cut-off frequency.](https://electronicsreference.com/wp-content/uploads/2021/03/image-15.png)
A low pass filter is designed to remove high frequencies from a complex input signal, leaving frequencies below the cut-off frequency of the filter fc.
High Pass Filter Calculators
Main Page: High Pass Filter Calculators
![A high pass filter blocks frequencies below its cut-off frequency.](https://electronicsreference.com/wp-content/uploads/2021/03/image-18.png)
High pass filters remove high low from the input signal, leaving frequencies above the cut-off frequency of the filter.
Band Pass Filter Calculators
Main Page: Band Pass Filter Calculators
![The band pass filter allows only frequencies in the passband to pass to the output.](https://electronicsreference.com/wp-content/uploads/2021/04/Band-pass-filter_action.gif)
A band pass filter is designed to remove frequencies above and below a selected band called the passband. It can be thought of as a combination of a high and low pass filter that allows only select mid-range frequencies to pass.
Band pass filters have two characteristic frequencies; fL represents the low frequency cut-off and fH is the high frequency cut-off. The passband is between fL and fH.