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Why does my MP130/MP2000/eMate whine when the backlight is on?

backlight emate mp2000 whine
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Why does my MP130/MP2000/eMate whine when the backlight is on?

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(From Robert Sexton’s FAQ) Backlit Newtons use the same technology that is found in indiglo watches. The backlighting uses high voltages, and this requires a transformer which makes the noise. If you listen carefully to an indiglo watch, you will notice the same effect. Apple published a tech note about it: http://docs.info.apple.com/article.html?

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