Kuna lülitused on väga kiired (signaal pulseerib, sellest ka nimi) ja viited on sobivaks seadistatud, siis inimsilm näeb asja erineva intensiivsusena ning selleks ongi kasutusel pulsilaiusmodulatsioon.
PWM generates rectangular pulse waveforms with different average values by adjusting the pulse width, and is able to process large signals with high efficiency and low sensitivity to noise.
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