>i tend to agree. it seems to me you are re-inventing a wooden
>carriage wheel when there's aluminum hi-tech ones available at every
>corner shop.
>can't you get in touch with korean notebook suppliers and use stuff
>that's already there ? i doubt you can be significantly cheaper than
>a not
> You must make sure that not only does your supply provide the peak current
>needed, it must also respond fast enough to current changes and the
>resulting dI/dT induced voltage swings must be restrained by appropriate >decoupling.
I'm hoping that by making the specs public people like you ca
There are a few other things to worry about, and I hope that when you add
them
all up you conclude that this isn't a good area for a novice to design in.
U/L labs approval...if you plug something into the wall, your insurance
carrier
should insist on it having U/L approval. There are a lot of rea
On Wednesday 01 May 2002 06:35 pm, Patrick Shirkey wrote:
> Reading the specs for the SFX power supply design guide it seems that the
> minimum for a 120watt power supply is 1.5 amps and the max is 19.2
Looking at the specifcation at
http://www.formfactors.org/developer/specs/microatx/microatxs
Paul Winkler wrote:
>
> Are you sure you don't want to use notebook components? :)
i tend to agree. it seems to me you are re-inventing a wooden
carriage wheel when there's aluminum hi-tech ones available at every
corner shop.
can't you get in touch with korean notebook suppliers and use stuff
On Wed, May 01, 2002 at 11:46:44AM -0700, Patrick Shirkey wrote:
> >> Looks like you can get 24volt off the shelf ones too:
> >> http://www.currentsolutions.com/search/dc_to_dc/pc-atx.htm
> >>
> >> disclaimer: I know nothing about electronics, I can just about add >>up ;)
>
>
> >I haven't re
On Wed, May 01, 2002 at 02:57:41PM -0400, Fred Gleason wrote:
> On Wed, 1 May 2002, Paul Winkler wrote:
>
> > I haven't read closely but this looks like it fits the bill perfectly.
> > You could run the 24V model off a pair of 12V batteries. Way cool!
> >
> > Would also be handy in a solar-power
On Wed, May 01, 2002 at 11:35:29AM -0700, Patrick Shirkey wrote:
> What is the liklihood of ever needing the maximum amps?
I have no idea. I'm in over my head already. :)
--
"Welcome to Muppet Labs, where the future is made - today!"
On Wed, 1 May 2002, Paul Winkler wrote:
> I haven't read closely but this looks like it fits the bill perfectly.
> You could run the 24V model off a pair of 12V batteries. Way cool!
>
> Would also be handy in a solar-powered studio. :)
Am I missing something here? Why not just go to TrippLite
On Wed, May 01, 2002 at 11:11:41AM -0700, Patrick Shirkey wrote:
> Care to draw a diagram for me? I can easily get it made here (Korea) but I need to
>have the specs first.
You don't want me designing your electronics. Given some time to play
and some expendable parts, I *might* get something wo
Steve Harris writes:
> On Wed, May 01, 2002 at 09:39:56 -0700, Paul Winkler wrote:
> > AC PSU in your computer. Seems daft, since the PSU then
> > converts the result back into DC of various voltages...
> > but that may be the most economical and expedient solution.
>
> Looks like you can g
>> Looks like you can get 24volt off the shelf ones too:
>> http://www.currentsolutions.com/search/dc_to_dc/pc-atx.htm
>>
>> disclaimer: I know nothing about electronics, I can just about add >>up ;)
>I haven't read closely but this looks like it fits the bill perfectly.
>You could run the
>Looking closer at the manual has revealed that it is actually a >microATX board.
>Unfortunately that page you sent doesn't say anything >about the power rating/demands
>for those kind of boards. Also remember >that it is a pIII which currently runs on a
>125watt power supply. >According to tha
>Basically you're imagining a device that can take a single, 24-volt
>battery, or two 12V batteries,
I'm thinking combinations of serial and parallel sets of NiCd or NiMH. Price and size
are definitely a factor here.
>and produces well-regulated +12V, +5V, -5V, -12V, and +3.3V from it.
>All
On Wed, May 01, 2002 at 06:57:25PM +0100, Steve Harris wrote:
> On Wed, May 01, 2002 at 09:39:56 -0700, Paul Winkler wrote:
> > AC PSU in your computer. Seems daft, since the PSU then
> > converts the result back into DC of various voltages...
> > but that may be the most economical and expedient
On Wed, May 01, 2002 at 09:39:56 -0700, Paul Winkler wrote:
> AC PSU in your computer. Seems daft, since the PSU then
> converts the result back into DC of various voltages...
> but that may be the most economical and expedient solution.
Looks like you can get 24volt off the shelf ones too:
http:
On Wed, May 01, 2002 at 09:39:56AM -0700, Paul Winkler wrote:
> and there are some DIY things on the web, search google!
> I just found this:
> http://www.google.com/search?hl=en&q=PC+battery+power+supply
whoops, I missed the specifig URL:
http://cybersake.www.cistron.nl/carmp3/
--
"Welcome
On Wed, May 01, 2002 at 08:01:41AM -0700, Patrick Shirkey wrote:
> Another question I have on this is what is the best way to connect the inverter to
>the board? Do I have to wire it into the power supply or can I get doubles of all the
>connectors that the power supply has and connect them dire
On Wed, May 01, 2002 at 08:01:41 -0700, Patrick Shirkey wrote:
> I get the impression that I am building my own power supply box in the process. Does
>anyone know of a product that is designed for this purpose already? In other words a
>power supply for a PC that runs on batteries?
The inverter
So the consensus is that I need to have an inverter.
Any ideas of a model that I should look at?
The emphasis from my end is on weight saving and slim line. I will then have to look
at the price too but that is definitely secondary.
Another question I have on this is what is the best way to co
On Tue, Apr 30, 2002 at 01:15:02PM -0700, Paul Winkler wrote:
> The other thing is that digital electronics are very picky about
> voltages, and battery voltage drops as the battery runs down.
> So you'll want voltage regulators in there (could be as simple as
> zener diodes w. appropriate resisto
On Tuesday 30 April 2002 08:15 pm, Paul Winkler wrote:
> The other thing is that digital electronics are very picky about
> voltages, and battery voltage drops as the battery runs down.
Which is one reason I recommend the inverter approach.
Oh, and I do this sort of thing for a living as a broad
On Tue, Apr 30, 2002 at 10:51:31AM -0700, Patrick Shirkey wrote:
> >It's determined by the formula
> >V = I*R, where V is voltage, I is current (amps), and R is the resistance
> >(ohms) of the device. So if V is right, and your power supply can
> >produce *at least* I, then you're fine.
>
> Th
Patrick, you might have a hard time finding a battery suitable for
delevering all required voltages.
If I look at the ATX spec (I presume you are using a standard atx
motherboard) you'll have to provide next voltages:
+3.3V +/- 5% (with remote sensing to compensate for voltage drops)
+5.0V
>It's determined by the formula
>V = I*R, where V is voltage, I is current (amps), and R is the resistance
>(ohms) of the device. So if V is right, and your power supply can
>produce *at least* I, then you're fine.
That works for me.
--
Patrick Shirkey - Boost Hardware Ltd
For the discerning
--- Lamar Owen <[EMAIL PROTECTED]> wrote:
>
>Is this a typical motherboard (ATX) or is this something oddball? My notebook
>requires 19.5V at the DC input -- but there are inside-the-case DC-DC
>inverters that transform to the required internal voltages.
>
>A standard MB takes +12V, -12V, 5V, a
On Tuesday 30 April 2002 02:39 pm, Patrick Shirkey wrote:
> >1.) Required voltage. What voltage is needed? If this is going to be
> > driving an inverter, 12V is typical.
> Why would I need an inverter if the power level from the batteres are
> correct in the first place?
> From my research so f
On Tue, Apr 30, 2002 at 07:39:26AM -0700, Patrick Shirkey wrote:
> Another question that I'm unsure of is whether having a battery that is too powerful
>for the machine is going to cause problems or is that not possible because the
>machine will just run for longer? Or is that where an inverter
>1.) Required voltage. What voltage is needed? If this is going to be driving
>an inverter, 12V is typical.
Why would I need an inverter if the power level from the batteres are correct in the
first place?
>From my research so far I have estimated that the machine would draw about 12v
>maxim
On Monday 29 April 2002 12:16 pm, Patrick Shirkey wrote:
> I am wondering if anyone can tell me how I can deduce the correct power
> rating for this machine so that I can design a battery pack that will power
> it efficiently.
Ok, there are several criteria to consider for sizing batteries:
1.)
>Doesn't the notebook computer come with batteries?
that would be a bitch wouldn't it :)
> The first option
>would be to obtain extra batteries for it, and charge them when you
>are within plugging distance of a wall socket.
:)
>Or do you want to run your laptop 24/7 on batteries? In that
> I'm looking to run a PIII 1ghz (with fan), 256 MB sdram, notebook
> ide/atapi HDD, onboard vga, 2xusb ports, 1xcdrom and 1xdvd using
> rechargable batteries. It is essentially a very cheap, and slightly
> large notebook without a monitor.
>
> Does anyone know what the required watts, volts and
Can someone point me to the right place for this question or give me an answer please?
I'm looking to run a PIII 1ghz (with fan), 256 MB sdram, notebook ide/atapi HDD,
onboard vga, 2xusb ports, 1xcdrom and 1xdvd using rechargable batteries. It is
essentially a very cheap, and slightly large not
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