摘要： 下面是 [低音升压电路]的电路图　　材料BOM表： P1 = 50K P2 = 100K R1 = 22K R2 = 470K R3 = 47K R4 = 10K R5 = 470R R6 = 1K Q1 = 2N2222 C1 = 2.2uF-25v C2 = 100nF-63v C31 = 00nF-63V C4 = 3.3uF-25v C5 = 470uF-25v D1 = 5mm. Red Led Q1 = 2N2222 B1 = 9v Battery J1 = RCA Audio Input Socket J2 = RCA Audio Output Socket S1 = On-Off Switch(责任编辑：电