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Author Topic: usb power?  (Read 1891 times)

Offline gamerdude767

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usb power?
« on: February 16, 2009, 03:00:57 PM »
hey guys,

            ive been wondering how much voltage a usb port supplies? I know when i strip a usb cable there are four wires. black and white are the positive and negative.. and the other two are for data (data+ data-).

 thanks scott
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Offline PspKicks316

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Re: usb power?
« Reply #1 on: February 16, 2009, 03:12:06 PM »
5v...
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Offline gamerdude767

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Re: usb power?
« Reply #2 on: February 16, 2009, 03:15:13 PM »
and to use a 0603 led with 5v i would need maybe a 120ohm resistor rite?
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Offline bustinthejustin

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Re: usb power?
« Reply #3 on: February 16, 2009, 03:51:35 PM »
Depends on the forward voltage of the led.
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Offline gamerdude767

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Re: usb power?
« Reply #4 on: February 18, 2009, 08:07:09 AM »
ok change of plan i need to make 12v how could i do that, could it be done with two usb ports? and how would i wire it?
« Last Edit: February 18, 2009, 08:19:15 AM by gamerdude767 »
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Offline PspKicks316

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Re: usb power?
« Reply #5 on: February 18, 2009, 12:43:18 PM »
Well, 2 usb ports in series would give you 10v.

5v + 5v = 10v...
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Offline phoenix_s

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Re: usb power?
« Reply #6 on: February 27, 2009, 06:00:07 AM »
can i screw up my usbports or even my mainboard on my laptop when i put them in series.....

Sry 4 my bad english     <--- i´ll put this in my signature^^
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Sry for my Bad english^^

Offline DubbleDutch

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Re: usb power?
« Reply #7 on: February 27, 2009, 06:37:04 AM »
firewire has 12v ;)
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Offline Tec_

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Re: usb power?
« Reply #8 on: February 27, 2009, 10:14:30 AM »
Quote from: phoenix_s on February 27, 2009, 06:00:07 AM
can i screw up my usbports or even my mainboard on my laptop when i put them in series.....

Sry 4 my bad english     <--- i´ll put this in my signature^^

If you try to draw to much current all that will happen is the USB port will shut down. Then you will need to uninstall the USB drivers and reinstall them to turn the port back on
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Offline phoenix_s

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Re: usb power?
« Reply #9 on: February 28, 2009, 06:07:08 AM »
@DubbleDutch my laptop don´t have fireware

@tec_ thx, i´ll try that
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Offline PhenomenalDesigns

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Re: usb power?
« Reply #10 on: February 28, 2009, 09:46:28 AM »
Yes, also if you just want it to be a usb activated powered thing, u could just make the usb activate a 5v relay (Make sure u use a diode for the back EMF) then attach another powersupply to the relay, and voila
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