USB power out?

J

JoeSP

Guest
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM) It
has a USB connector and a 5V external AC adapter, which is the only source
of power for the drive. It's a standard internal CD drive out of a laptop
that is put in a slim case by the manufacturer, and sold as an external. I
see that similar drives on the market are able to operate on USB power
alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the USB
port on bootup.)

I am searching for some type of USB jack which would allow 5V to be drawn
out of the USB connector and delivered to the power input jack of the
external drive. This would allow me to use my external drive on USB power
without the need to search for an AC outlet each time I need to use it.

I understand the caution that the drive may consume more power than the USB
can deliver, but I think it's worth a try. The worst that could happen is
that the device won't operate, and I'd then go back to the AC adapter. If
by some remote chance, it damages the unit, I'm only out the $40 I paid for
the drive on ebay.
 
JoeSP wrote:
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM) It
has a USB connector and a 5V external AC adapter, which is the only source
of power for the drive. It's a standard internal CD drive out of a laptop
that is put in a slim case by the manufacturer, and sold as an external. I
see that similar drives on the market are able to operate on USB power
alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the USB
port on bootup.)

I am searching for some type of USB jack which would allow 5V to be drawn
out of the USB connector and delivered to the power input jack of the
external drive. This would allow me to use my external drive on USB power
without the need to search for an AC outlet each time I need to use it.

I understand the caution that the drive may consume more power than the USB
can deliver, but I think it's worth a try. The worst that could happen is
that the device won't operate, and I'd then go back to the AC adapter. If
by some remote chance, it damages the unit, I'm only out the $40 I paid for
the drive on ebay.


I have a PCMCIA USB card for my laptop, which came with an adapter that
Click to expand...
connects to another USB port for extra power. If you search, you might
be able to find one at a computer accessory store.
Check the current rating of your drive - most USB ports are limited to 1
amp, and a miniature fuse will blow if you exceed that.
 
hay, if your drive only needs 500ma or less to work then you can wier it to
use usb power, the thing might also be using usb power alredy and using ac
to supplimant, reduses the lode on the ac adapter.

check in the device mamager to see how much power it is drawing from usb,
and look at the ac adapter to see how much lode it can haldle, this is
usless it the adapter is not the 1 that came with the drive.

to check usb power usage, use a tool like usbview, google for it, or get
into the device manager.

to get there right click on the my computer icon on the desktop or startmenu
under winxp, click properties, you will either see a tab that says device
manager in win9x or hardware in win2k/xp, if win 2k/xp click on the hardware
tab, then the device manager button.

once there expand the universal sieral bus adapters groupe

then look in all the usb root hubs and other hubs for the power consumption
intermation.

--
diehard67
http://www.diehard67.ca
"JoeSP" <olegp@telus.net> wrote in message
news:8q00g.89648$%H.46570@clgrps13...
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM)
It has a USB connector and a 5V external AC adapter, which is the only
source of power for the drive. It's a standard internal CD drive out of a
laptop that is put in a slim case by the manufacturer, and sold as an
external. I see that similar drives on the market are able to operate on
USB power alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the
USB port on bootup.)

I am searching for some type of USB jack which would allow 5V to be drawn
out of the USB connector and delivered to the power input jack of the
external drive. This would allow me to use my external drive on USB power
without the need to search for an AC outlet each time I need to use it.

I understand the caution that the drive may consume more power than the
USB can deliver, but I think it's worth a try. The worst that could happen
is that the device won't operate, and I'd then go back to the AC adapter.
If by some remote chance, it damages the unit, I'm only out the $40 I paid
for the drive on ebay.
Click to expand...
 
"diehard67" <ax@bx.cx> wrote in message
news:Zov1g.38566$7a.30664@pd7tw1no...
hay, if your drive only needs 500ma or less to work then you can wier it
to use usb power, the thing might also be using usb power alredy and using
ac to supplimant, reduses the lode on the ac adapter.

check in the device mamager to see how much power it is drawing from usb,
and look at the ac adapter to see how much lode it can haldle, this is
usless it the adapter is not the 1 that came with the drive.

to check usb power usage, use a tool like usbview, google for it, or get
into the device manager.

to get there right click on the my computer icon on the desktop or
startmenu under winxp, click properties, you will either see a tab that
says device manager in win9x or hardware in win2k/xp, if win 2k/xp click
on the hardware tab, then the device manager button.

once there expand the universal sieral bus adapters groupe

then look in all the usb root hubs and other hubs for the power
consumption intermation.

--
diehard67
Click to expand...
It's not using any power thru the USB. I was hoping to draw 5V out of the
USB port, to avoid using the bulky AC adapter.

Thanks for the help, but man, you're a terrible speller.







http://www.diehard67.ca
"JoeSP" <olegp@telus.net> wrote in message
news:8q00g.89648$%H.46570@clgrps13...
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM)
It has a USB connector and a 5V external AC adapter, which is the only
source of power for the drive. It's a standard internal CD drive out of a
laptop that is put in a slim case by the manufacturer, and sold as an
external. I see that similar drives on the market are able to operate on
USB power alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the
USB port on bootup.)

I am searching for some type of USB jack which would allow 5V to be drawn
out of the USB connector and delivered to the power input jack of the
external drive. This would allow me to use my external drive on USB
power without the need to search for an AC outlet each time I need to use
it.

I understand the caution that the drive may consume more power than the
USB can deliver, but I think it's worth a try. The worst that could
happen is that the device won't operate, and I'd then go back to the AC
adapter. If by some remote chance, it damages the unit, I'm only out the
$40 I paid for the drive on ebay.
Click to expand...
 
Smell Checquer Not Vorking, Yah??
"JoeSP" <olegp@telus.net> wrote in message
news:JQD1g.328$2c3.239@edtnps89...
"diehard67" <ax@bx.cx> wrote in message
news:Zov1g.38566$7a.30664@pd7tw1no...
hay, if your drive only needs 500ma or less to work then you can wier it
to use usb power, the thing might also be using usb power alredy and
using ac to supplimant, reduses the lode on the ac adapter.

check in the device mamager to see how much power it is drawing from usb,
and look at the ac adapter to see how much lode it can haldle, this is
usless it the adapter is not the 1 that came with the drive.

to check usb power usage, use a tool like usbview, google for it, or get
into the device manager.

to get there right click on the my computer icon on the desktop or
startmenu under winxp, click properties, you will either see a tab that
says device manager in win9x or hardware in win2k/xp, if win 2k/xp click
on the hardware tab, then the device manager button.

once there expand the universal sieral bus adapters groupe

then look in all the usb root hubs and other hubs for the power
consumption intermation.

--
diehard67

It's not using any power thru the USB. I was hoping to draw 5V out of the
USB port, to avoid using the bulky AC adapter.

Thanks for the help, but man, you're a terrible speller.







http://www.diehard67.ca
"JoeSP" <olegp@telus.net> wrote in message
news:8q00g.89648$%H.46570@clgrps13...
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM)
It has a USB connector and a 5V external AC adapter, which is the only
source of power for the drive. It's a standard internal CD drive out of a
laptop that is put in a slim case by the manufacturer, and sold as an
external. I see that similar drives on the market are able to operate on
USB power alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the
USB port on bootup.)

I am searching for some type of USB jack which would allow 5V to be
drawn out of the USB connector and delivered to the power input jack of
the external drive. This would allow me to use my external drive on USB
power without the need to search for an AC outlet each time I need to
use it.

I understand the caution that the drive may consume more power than the
USB can deliver, but I think it's worth a try. The worst that could
happen is that the device won't operate, and I'd then go back to the AC
adapter. If by some remote chance, it damages the unit, I'm only out the
$40 I paid for the drive on ebay.
Click to expand...
 
I was talking about a way to steel power from usb to run the thing if the
drive needs 500 ma or less power you can rewire the device or a usb cable to
steel power for it.

you have to know if it is using some usb power already like my cannon
scanner, it has a power adapter in the wall and still draws some usb power,
not to sure why.

if your dvd drive uses more them 500ma then you can't run it on usb power
you will burn out your motherboard.

http://pinouts.ru/data/USB_pinout.shtml

that link shows the pinout for usb, if you know the pinout for the powerjack
on your dvd drive you could use a peace of cord that fits it and a spare usb
cable to make an adapter to steel usb power, or add 2 wires in side the case
and disable external power all together, or use a diode and a peace of wire
so you could safely use usb and external power.

I have never herd of adapters that could steel usb power raw for this kind
of use.

you may want to think vary carefully before you try this because you could
kill your warranty.

there I even remembered to spell check this time lol.

--
diehard67
http://www.diehard67.ca
"JoeSP" <olegp@telus.net> wrote in message
news:JQD1g.328$2c3.239@edtnps89...
"diehard67" <ax@bx.cx> wrote in message
news:Zov1g.38566$7a.30664@pd7tw1no...
hay, if your drive only needs 500ma or less to work then you can wier it
to use usb power, the thing might also be using usb power alredy and
using ac to supplimant, reduses the lode on the ac adapter.

check in the device mamager to see how much power it is drawing from usb,
and look at the ac adapter to see how much lode it can haldle, this is
usless it the adapter is not the 1 that came with the drive.

to check usb power usage, use a tool like usbview, google for it, or get
into the device manager.

to get there right click on the my computer icon on the desktop or
startmenu under winxp, click properties, you will either see a tab that
says device manager in win9x or hardware in win2k/xp, if win 2k/xp click
on the hardware tab, then the device manager button.

once there expand the universal sieral bus adapters groupe

then look in all the usb root hubs and other hubs for the power
consumption intermation.

--
diehard67

It's not using any power thru the USB. I was hoping to draw 5V out of the
USB port, to avoid using the bulky AC adapter.

Thanks for the help, but man, you're a terrible speller.







http://www.diehard67.ca
"JoeSP" <olegp@telus.net> wrote in message
news:8q00g.89648$%H.46570@clgrps13...
I have an external CDRW/DVD combo drive made by Dynex (model DX-CMBOSLM)
It has a USB connector and a 5V external AC adapter, which is the only
source of power for the drive. It's a standard internal CD drive out of a
laptop that is put in a slim case by the manufacturer, and sold as an
external. I see that similar drives on the market are able to operate on
USB power alone, and require the AC adapter only for booting from CDROM.
(Understandable because the computer may not be supplying power thru the
USB port on bootup.)

I am searching for some type of USB jack which would allow 5V to be
drawn out of the USB connector and delivered to the power input jack of
the external drive. This would allow me to use my external drive on USB
power without the need to search for an AC outlet each time I need to
use it.

I understand the caution that the drive may consume more power than the
USB can deliver, but I think it's worth a try. The worst that could
happen is that the device won't operate, and I'd then go back to the AC
adapter. If by some remote chance, it damages the unit, I'm only out the
$40 I paid for the drive on ebay.
Click to expand...
 
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Hash: SHA1

diehard67 wrote:
I was talking about a way to steel power from usb to run the thing if the
drive needs 500 ma or less power you can rewire the device or a usb
cable to
steel power for it.
[snip]
Click to expand...

Hi,
While it is true that a USB device may consume up to 500mA from the
port, it is ALSO true that technically you are required to communicate
with the host and ASK for the additional power before you're allowed
to take it. The specifications say that you are guaranteed up to 100mA
whenever the bus is not in SUSPEND mode, and you can ask for up to
500mA, a request which may or may not be granted, as the
motherboard/OS/BIOS/whatever sees fit. Hope this comment prevents
somebody from blowing up an expensive motherboard sometime :)

Good luck,
Chris
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