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electronic filter circuit

2017-02-23 16:18  
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electronic filter circuit
BG1 and BG2 form mulriple pipe.This circuit adds the filter element to the base of mulriple pipe which is different from others. The magnification coefficient of mulriple pipe β=β1•β2,so the filtering effect obtained from BG2 emitter is β1 times over L1 and C6,which equals that the big capacitance and inductance are added to the circuit.The most of hum in the circuit is restrained.And because the circuit adds L2 and C7 as well,their filtering effect was expanded β2 times by BG2,and leaches residual hum further.