This brochure is essential for both the calculation of filters and in the tutorial lesson of Circuit Theory II (filters) and is based on the book "Filters" by the author.

Normalized values for the calculation of LC Butterworth and Chebyshev filters are provided. Additionally, the coefficients of the Butterworth, Chebyshev, and Bessel polynomials are given in the form of products for the calculation of active filters.

Furthermore, a catalog for the calculation of all forms of active filters used in practice is provided. Instructions for the proper use of resistors, capacitors, and operational amplifiers for active filters are also included.

Finally, nomograms for calculating the order of Butterworth and Chebyshev filters are provided along with the formulas for calculating the order of these filters.