The very beginning of the final thesis tells us what we will encounter in this final thesis. Electronic filters are electronic devices which task is to leak some signals or to stop them and that is all based on their cut-off frequency. There are 4 basic types of filters: low-pass, high-pass, band-pass, and stop-band electronic filters. Every type of filter has its characteristics such as the cut-off frequency at which they leak or stop signals. Depending on the type of filter we want to build, it can be made from passive or active components. If it is built from passive components then that will be a passive filter and if it is built from active components then that will be an active filter. On electronic filters, we can have measurements like input and output voltage measurement, cut-off frequency measurement, or attenuation measurement. Those measurements can be performed using devices such as an oscilloscope, multimeter, or spectrum analyzer. In the practical part of the final thesis, we will apply the theoretical knowledge which we have from before then we will measure input and output voltage, cut-off frequency, and attenuation of the cascade low-pass filter. Through the practical part of the final thesis we made some conclusions like the cut-off frequency depends on the values of passive elements that we use in the passive filter and if we have more cascades (if the order of the filter is larger) than for the consequence the cut-off frequency will be smaller, gain and the factor of the goodness filter will be smaller.