Re: Power supplies in parallel for more current/same voltage?
- From: w_tom <w_tom1@xxxxxxxxxxx>
- Date: Mon, 14 Nov 2005 19:45:30 -0500
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!
.
- References:
- Power supplies in parallel for more current/same voltage?
- From: Daniel Morrow
- Re: Power supplies in parallel for more current/same voltage?
- From: Gerard Bok
- Re: Power supplies in parallel for more current/same voltage?
- From: Ken Taylor
- Re: Power supplies in parallel for more current/same voltage?
- From: Gerard Bok
- Re: Power supplies in parallel for more current/same voltage?
- From: Ken Taylor
- Re: Power supplies in parallel for more current/same voltage?
- From: Daniel Morrow
- Power supplies in parallel for more current/same voltage?
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