The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by applying an external voltage (or current) to CONT.
调整内部极限和扳机电压可以修正定时器的操作，扳机电压是通过将外部电压（或电流）应用于CONT来实现的。
Threshold voltage decides the output voltage turning time of 555 timer.
阈值电压决定555IC定时器输出电压的翻转时刻。
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