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   2Â÷ Active Àú¿ªÅë°úÇÊÅÍ : ft005.sch

   2Â÷ Active Low Pass Filter 

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                                             fc = -------------- ( C1 = 2¡¿C2,  R1 = R2 )
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   ½Ã¹Ä·¹ÀÌ¼Ç Á¶°Ç : AC Sweep  -> Pts/Dec[101],Start Freq[10],End Freq[100k] 
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