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  • ...flat filter]].<ref>S. Butterworth, "On the Theory of Filter Amplifiers", ''Wireless Engineer'', '''vol. 7''', 1930, pp. 536–541</ref> The equations Norton gi ...filter]]s can be brought to bear. The equivalents of [[stub (electronics)|stubs]] and [[quarter wave impedance transformer|impedance transformers]] are bot
    52 KB (7,784 words) - 14:49, 10 December 2011