Get surprisingly good sound from disposable picnicware with this easy to make and inexpensive Styrofoam Plate Speaker. Thanks go to José Pino for the original article in Make Magazine.
To download Styrofoam Plate Speaker MP4 click here or subscribe in iTunes.
Check out the Styrofoam Plate Speaker article MAKE 12 "Styrofoam Plate Speaker" & You can see that in our digital edition.
Posted by KipKay |
Jul 18, 2008 07:00 AM
MAKE Podcast, MAKE Video, Weekend Projects |
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The first thing I'm wondering is, if the fidelity could be improved by elevating the magnet off of the cardboard a bit to center it in the coil. This could be done with a round of foam, or something similar, with a diameter slightly smaller than the magnet. It's a thought, anyway.
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what do you think the minumum voltage for this to work is?
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I could be wrong, but i think it's possible to seriously damage your amplifier hardware if the speaker impedance is too low. Its like running a wire over a 9-v battery -- too small a load results in lots of power lost as heat. It should probably be emphasized that the coil should read at least 6-8 ohms on your meter to be absolutely sure you won't damage anything.
Less than 8 ohms is probably okay, since resistance is only half of the impedance equation, but since its difficult to measure the reactance of a coil over the audible spectrum without expensive equipment, its better to be safe than sorry.
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