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In this paper, single-phase shunt active power filter (APF) controlled through hysteresis-current control is studied. A proposition is made to use the limitation on the maximum switching frequency of the power devices. This limitation increases stability to electromagnetic influences and facilitates filtering of the radio interference to the source network. In the paper, there are attached computer simulations' results and experimental oscilogrammes from the filter operation together with a combination of loads -linear (active inductive) and non-linear (single-phase bridge uncontrolled rectifier with capacitive load). The APF's control is based on DSP TMS320LF2407.