This paper presents a set of programs enabling the user to design easily either low-pass, high-pass, or band-pass active filters, with Chebyshev and Butterworth approximations (up to 16th order). All these programs are running on a programmable pocket calculator (HP-41C). Component values are chosen by the program among the standard values (for instance E12, E24,...). Deviation between designed and theoretical filters is also computed, according to component accuracies.
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