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The author has realized studies of the low-pass, high-pass, band-pass and band-rejection active filter with operational amplifiers. The studies has included building and simulation on PC this circuits realized with operational amplifiers. This paper presented the work above low-pass and high-pass first-and second order filters. Those are presented electrical schemes of the filters and the graphical results of the simulation and the conclusions after the comparison between the simulation and thefatcat:hhdqj4s4wfejddepx6mo35hqai