求翻译：The second difference is the use of a single pulse width modulator circuit to drive the LEDs. The PWM circuit receives an 8-bit value and generates an output waveform with a duty cycle proportional to the 8-bit value. This is very similar to the DAC module used in a previous assignment, and allows for the intensity of the LEDs to be adjusted. Note that the single output of the PWM is used to drive all eight LEDs in parallel so that it would be easy to see changes in intensity.是什么意思？

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