引用:
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一看就知道不是業界人士... 你知道目前市面上電源供應器在待機時的切換頻率是多少嗎？ 你知道切換頻率與待機中功率消耗之間的關係嗎？ 人耳可聽到的頻率範圍是多少？
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http://tangentsoft.net/audio/opamp-ps.html
人耳最多聽到2KHz，隨年齡遞減，這是常識吧。
業界人士又如何？到底想說啥？交換式電源供應器一定不能用於音響嗎？
The disadvantages of a switcher are that
the switching component adds quite a bit of noise to the output power. I’ve seen many different switching frequency signatures.
The better switchers have all of their noise up in the megahertz range, so that there’s virtually no noise in the audio band. More commonly the switching frequency is up in the tens of kHz with some sub-harmonics extending into the audio band, plus possibly also some low-frequency ripple.
Then there are the really cheap switchers, with a switching frequency right in the middle of the audio band.
這篇是講交換式電源用於音響:
http://powerelectronics.com/power_m...dio-Systems.pdf