【简答题】555定时器芯片接成的电路如图(a)所示。 (1)该电路的名称是什么? (2)若 V CC =10V, R =10kΩ, C =300pF,计算其暂态脉冲宽度 t po 。 (3)给定输入 u I 的波形 如图 (b) 所示,已知低电平时长为10μS,试 画出电容电压 u C 的波形和对应的输出 u o 波形。 (4)如果在 图 (a)的555定时器芯片的 5脚外接一个+5V的电压源,问暂态脉冲宽...
【单选题】听力原文:W: Have you decided what you're doing for your summer vacation, Mark? M: Well, Liz and I would like to go to Italy together, but the prices that our travel agent has given us are way out of our b...