Messages in this thread | | | Date | Wed, 13 Jun 2007 11:22:32 +0200 | From | Helge Hafting <> | Subject | Re: PC speaker |
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Jan Engelhardt wrote: > Since you can set the x86's crystals frequency from 1193182 to 18 Hz > (PIT_TICK_RATE / 1 to PIT_TICK_RATE / 65535) [*], you can never really > bust it. But even then, what would a speaker do it was constanly given > +5V? (I _suppose_ the other level is 0V, not -5V -- makes for easy > design.) That's IMO just like a sound file with volume(x) = 1, nothing > spectacular if you ask me. >
I guess a motherboard don't provide enough current to burn out that speaker.
But generally, speakers that handle some maximum alternating current *will* burn out if you give them the same amount DC. This becasue speakers are designed to handle AC - some of the energy is dissipated as sound waves, some as an alternating magnetic field, some has heat. And the speaker moves, so moving air helps cooling it.
A speaker getting DC converts all that current into heat only, and it stands still so no extra cooling. So it burns out.
Helge Hafting
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