Therefore, when the clock goes high, IC2 produces an output count.
因此，当时钟变为高电平时，IC2产生一个计数输出。
Omit resistor R3 if IC2 includes built-in pullup resistors, as do many modern microcontrollers.
如果IC2包括内置的上拉电阻，就可以忽略电阻r 3，许多现代微处理器都是这样的。
Rising overvoltage turns off both transistors in IC2, interrupting current flow through the control LED of IC3.
增加过电压关闭IC2中的电阻，通过IC3的控制LED中断电流流动。
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