Add to ORKGThis thesis explains designing frequency filters with active adjustable (regulable). Basic filter division, features and characteristics are shown in the first part. Second part includes active components and their realization. Third part is dedicated to basic methods and one of them is chosen for realization.The fourth part describes simulated frequency filter in differential and nondifferential form. Last part contains design and simulation of two frequency filters with adjustable components based on chosen method.In the fifth part is located my own project: Universal frequency filter. The last section contains pratical measuring and realization. Conclusion contains thesis evaluation and explanation of difficulties that occured during wor...