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tinear · 03-21-2009, 06:51 PM

Quote:

Originally Posted by smokingclam

Better off getting a usb hub and hooking into that if possible. At least if you have a problem the hub should be the first thing to go hopefully!

definitly the way to go with any USB peripherals. powered hubs are a must! most 'putes can't handle a device drawing any significant amperage.

here's a link i fast searched that , while not PV related, explains a bit.

Existing USB ports may face trouble powering new breed of peripherals | Berlind’s Testbed | ZDNet.com

[edit - forgot link!

]

MonkeyMonk · 03-22-2009, 01:20 AM

Thank you! This was a very informative thread!

Chas · 04-01-2009, 08:35 PM

Further to what's already been said about USB devices, I've just plugged my 901 USB charger into my old laptop, and it doesn't show up as a USB device in USBViewer. So I suspect it's not actually enumerating as a USB device, and therefore the power it draws probably isn't limited at all. So if it wants more than 500 mA....

I certainly won't be plugging it into my new laptop until I can find a spare hub...

Jim Davis · 04-02-2009, 01:59 AM

Quote:

Originally Posted by Chas

I certainly won't be plugging it into my new laptop until I can find a spare hub...

I'd never plug one into my computer. There are two ways to go.
1) A USB hub with external power supply.
2) A 110v to USB adapter. (Quite cheap at Best Buy)

ApOsTle51 · 04-02-2009, 05:57 PM

Quote:

Originally Posted by Chas

Further to what's already been said about USB devices, I've just plugged my 901 USB charger into my old laptop, and it doesn't show up as a USB device in USBViewer. So I suspect it's not actually enumerating as a USB device, and therefore the power it draws probably isn't limited at all. So if it wants more than 500 mA....

I certainly won't be plugging it into my new laptop until I can find a spare hub...

you got that the wrong way around

.

If the PC doesn't talk with the device then the device is limited to 100mA. It's not until the device communicates with the pc that it can step up to a higher power mode. Because your PC doesnt recognise the usb device it's limited to the low power mode @100mA.
I'm suprised the passthrough's work at all tbh. I have heard tho that they do perform better on a powered hub or a USB power pack.

Chas · 04-04-2009, 12:33 PM

Yup, looks like I got that wrong

Will put my multimeter on the charger to see what is actually happening.

03-22-2009, 01:20 AM	#22
MonkeyMonk Adrian's Quirky Sister Join Date: Feb 2009 Posts: 715	Thank you! This was a very informative thread! __________________ How strange is the lot of us mortals! Each of us is here for a brief sojourn; for what purpose he knows not, though he senses it. But without deeper reflection one knows from daily life that one exists for other people. Albert Einstein

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04-01-2009, 08:35 PM	#23
Chas Junior Member Join Date: Mar 2009 Posts: 2	Further to what's already been said about USB devices, I've just plugged my 901 USB charger into my old laptop, and it doesn't show up as a USB device in USBViewer. So I suspect it's not actually enumerating as a USB device, and therefore the power it draws probably isn't limited at all. So if it wants more than 500 mA.... I certainly won't be plugging it into my new laptop until I can find a spare hub...

04-04-2009, 12:33 PM	#26
Chas Junior Member Join Date: Mar 2009 Posts: 2	Yup, looks like I got that wrong Will put my multimeter on the charger to see what is actually happening.