Daniel Morrow
Guest
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 Posted:
Sun Dec 04, 2005 9:35 am Post subject:
Re: Power supplies in parallel for more current/same voltage |
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"w_tom" <w_tom1@hotmail.com> wrote in message
news:43792FAA.A3CF3AC1@hotmail.com...
| Quote: | 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!
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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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