i have two signal at input(ac+dc) but i want only dc.and wanted to remove ac.so for that purpose i am using butterworth filter
and its cutoff frequency=20hz,
now kindly tell me
1:which butterworth filter amp i use low or high pass?
2:while input have both ac and dc signal but i want output of that filter is only dc(1.5volts).
3:after getting this dc of 1.5v we have to amplify to 12volts.so which amplifier i can use please send the circuit 4:plz send me butterworth filter(specifications) design and circuit diagrams.
plzzzzz i need this argent...
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