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【简答题】
由555 集成定时器组成的电路如图E.4所示。HL为信号灯,已知: =30 kW, =10 kW, =500 kW, =0.01μF, =50μF。当 的阻值调到最大时, 要求: (1) 定性地画出 u C 和 输出电压 u O 的波形; (2) 求信号灯 HL 亮和灭的时间各为多少?
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