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I need 9V DC what happens if I USB it? Answered

I'm making a compact speaker enclosure that will fit in a laptop bag I've got everything together and looking sweet. making this because my ACER laptop has crappy sound and I want to be able to hear things on it when I travel. I have sick speakers at home but there very not portable. problem right now is power is supplied by a 9V DC adapter I really hav no mre room to make any other type of circuit or battery pack........its pretty tight. what happens if I just cut the adapter and put a USB end on it? I realize it will only provide 5 Volts but will it work?......... maybe just reduced power? will any damage result? I know only a little about voltage and most of my electrical experience is through trial and error. (not recomended, I've zapped myself more then a couple of times) Ideas?

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chaoscampbell (author)2007-11-15

I'm willing to just try it......but I don't wanna fry my USB port......if someone can atlest tell me my comp will be safe I'll just try it

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guyfrom7up (author)chaoscampbell2007-11-15

I'm pretty sure it won't fry your USB port, but don't hold my word against it. But I can point you in the right direction: The walwart should have a sticker or engraving saying the input and output. The output should be 9 volts, you have to tell me the mA, it will probably be around 300-400, but the highest it'll ever be will be 1000mA. If the mA is less than 500 you can plug it into a high power USB port (don't blame me if anything bad happens though) A different aproach is to use a AC to USB adapter, have it rated around 500 or 600 mA and see if it works.

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chaoscampbell (author)guyfrom7up2007-11-15

it says: Class 2 power supply Description: AC-8 Model No: blah blah INPUT: 120VAC 60Hz 21.6VA OUTPUT: 9VDC 700mA

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