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LM3886的问题

Other Parts Discussed in Thread: NE5534, LM3886

本人小白......前级使用NE5534

LM3886使用典型电路的接法......前后级通过一个4.7UF的电容耦合

这个电路放大功率一阵子音乐没有问题......但是放一会就发出刺啦刺啦的响声用示波器测出来的波形如上图

断电以后再上电恢复正常......一段时间后又成这样了......