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PMP10478设计变压器有吱吱声

Other Parts Discussed in Thread: PMP10478

采用PMP10478的设计,空载时变压器很安静,有负载时变压器有吱吱声像煮开水似的,输出功率越大,声音越大,请问该调该设计电路的哪部分元件的参数?