The other day I noticed my Xmas tree makes a high pitched whistling sound when it's turned on. I've noticed this in other gadgets, too, but never in something so simple (two chips a ceramic capacitor and a couple of resistors). Does anybody know what causes them? Surely a sound requires a mechanica…

High pitch sound from electronics...

fungus January 7, 2013, 9:33pm 5

If it's the capacitor then Mike's circuits must sound like a symphony from hell...

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