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AktivFilter is a program for the design of active bandpass filters, highpass and lowpass filters with operational amplifiers. The special feature of this program is the ability of co-ordinating the component values of the filter circuit with the type of operational amplifier and with the standard series (E12, E24, E48 or E96) of the component values. Thus a later adjustment of the built circuit becomes unnecessary. For many applications AktivFilter enables you to use inexpensive opamp types instead of expensive ones. Developers of audio electronics, e.g. studio and high end equipment, can also profit from AktivFilter, as this program supports some high-quality audio opamps.