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Analog Filter Calculator
Calculate analogue filter parameters directly on this page.
Note: Graph colours Red = Magnitude, Blue = Phase. Complex frequency: s = σ + jω = σ + j·2π·fo.
http://www.calculatoredge.com/korean.htm#electrical
Analogue Filter Calculator
ATmega Timer/Counter/Prescaler Calculator
http://blog.daum.net/ds5tuk/7818266