555芯片为什么管脚4是有电压,测了一下有2点几伏,是不是坏了呢? 请问555芯片 4脚说，此时不论TR， TH处于何电平，这里...
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NE555的4脚是控制重置信号输入，视乎人体感应的输出是什麼类型，令NE555烧坏可能不大。又NE555在整个电路上的作用是什麼，有需要上存电路图。
你控制的什么灯啊,工作电流多少?是不是超过了555的输出电流?
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