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Bandpass filter circuit

2017-02-27 03:13  
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Bandpass filter circuit
This circuit should determine the value of the R1 aforehand which is similar to the signal source resistance r1/ The principle of parameter selection is R4 = R3,C1 equals to C2 approximately,and Q equals to or lesser than R1,500K>R>1K,0.5uF>C>200pF.