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我有两个这样的电路，一个输出负零点几伏，一个输出接近+15伏，电路都一样的，LM3886不是在一家买的。哪个是正常的。D7是个30v稳压管
亲；真不知该怎样回答你。去TI网上商城或武汉力源买点正经东西试试吧。
