Re: Power supplies in parallel for more current/same voltage?
- From: "Daniel Morrow" <videoman@xxxxxxxxxxxx>
- Date: Sat, 3 Dec 2005 23:48:45 -0800
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"w_tom" <w_tom1@xxxxxxxxxxx> wrote in message
news:43792FAA.A3CF3AC1@xxxxxxxxxxxxxx
> Removing a device without first turning the device off in
> Windows will not crash NT based operating systems. It may
> crash Windows 9x/ME systems that are not as resilient because
> failed task in non- preemptive systems can lock the OS. If a
> device is removed without first turning off, then data inside
> the camera could be lost. This has been demonstrated with a
> camera, USB port, and Windows 2000. But it never locks the NT
> OS - as NT OS design even demands.
>
> If disconnecting camera without first telling computer
> causes computer to crash, well, it was recently solved on that
> Windows 2000 system. Static electricity from a nylon carpet
> and air that was too dry created problems. Eventually, the
> static electricity destroyed camera's USB interface.
>
> Informing computer before removing USB cable is a data
> protection function. USB peripherals should never lock or
> crash an NT based OS such as Windows 2000.
>
> Meanwhile, I find numerous 3 volt external power supplies in
> 10 and 18 watt sizes just in www.alliedelec.com alone. But
> again, required is some idea of acceptable ripple voltage and
> regulation. Otherwise, spend more money on a superior power
> supply. Figure at minimum $20.
>
> Daniel Morrow wrote:
> > I am glad I asked before trying it. I have reviewed what you all
have
> > said and realized that it normally isn't a problem (supplying
power
> > to a digital camera) because people almost always just plain use
> > batteries, and after kicking things around in my head realized I
> > won't do otherwise (i.e. I will stick to batteries for these 2
> > cameras), my fathers' pocket camera can run off of a 1300
milliampere
> > universal so when I transfer the images from the camera to
computer
> > the camera will stay on and not shut off due to low battery
levels,
> > in turn that will keep windows 2000 professional service pack 4
from
> > crashing etc. (windows 2000 and xp suffer from not being true
plug
> > and play compatible operating systems - if you shut a device off
> > without telling the operating system to unplug/eject a device
through
> > the windows add/remove hardware wizard the operating system can
> > crash). The pocket camera can take 40 to 50 minutes to download 1
32
> > megabyte flash memory card's worth of pictures and at times there
are
> > 2 or 3 of those cards to download, so if the camera shuts off
after 1
> > I usually have to reboot to do the next, etc.. I would like to
just
> > be able to leave the camera on for an hour and get back to it
then
> > instead of waiting for the variable amount of time to pass by
> > watching it the whole time and start the next card download. Do
you
> > see what was my predicament before my purchase of a universal
1300 ma
> > power supply? That power supply has solved my problem. Now one of
my
> > 2 other cameras is labled at 3 volts at 2 amps for a wall-wart
> > wall-mount power supply, but because these 2 cameras use usb to
> > transfer their card's memory contents it is fast enough for me
to
> > monitor the transfer, etc.. The pocket camera uses the serial
port
> > for transferring so that is why it is so slow. If these newer
> > operating systems were as plug and playable as windows 98 first
> > edition for example then this wouldn't even be a problem at all.
> > Solution - I will use my current wall mount universal power
supply
> > with the pocket camera and use batteries (rechargeable) for the
2
> > other cameras. It is really frustrating to not be able to find
decent
> > high powered power supply though - I doubt anyone has ever really
run
> > into this problem I guess though. I can't even get the
add/remove
> > hardware wizard to list any devices when I want to unplug/eject
a
> > device too, and that's on 2 separate computers. I don't know
what's
> > going on with that but what I do instead is do my "unplug/eject
a
> > device"ing from the device manager which seems to do the job
100%.
> > Good luck all and thanks for keeping me from frying digital
cameras,
> > later!
I have to disagree on your statement that you say unplugging a plug
and play usb device will not crash the windows 200 operating system.
If you unplug a usb device improperly a window pops up telling you to
not do that and that the operating system may crash if you do do that
and you can ALSO lose data. My windows 2000 professional operating
system totally disagrees with your statement - and I wish it wouldn't
to be honest. I wish for the best but don't get it all of the time
like this time. Summary - you are wrong - windows 2000 professional
even says so. Good luck and later!
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