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   2차 유니버셜 필터 : ft011.sch

   Universal Filter ( LPF, BPF, HPF )

                                               1                         1 + R4/R5
                                  fc = ----------         Q = ------------
                                           2πC1R6                          3
 

                                  ( R1 = R2 = R3 = R5,  R6 = R7,  C1 = C2 )

 
   시뮬레이션 조건 : AC Sweep  -> Pts/Dec[101],Start Freq[10],End Freq[100k] 
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