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。

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This FET transistor, used here as variable resistor it's part of reaction circuit of IC2.

这FET晶体管，这里用作可变电阻的电路ic2的反应的一部分。

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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。

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