Inverter wattage output.

> I am working on a project with With a 512M USB2 card and a mini-itx
> motherboard, power consumption is around 15 W
>
> Still playing with a Linux distie, with X and Wine on it. Any suggestions ?
>
> Steve

Hey is there some kind of linux-landrover analogy here?
I've always believed that my interest in the linux-way-of-thinking
(downloading source/compiling/fixing-without re-booting) was very
similar to my reasons for running a land (sourcing from a variety of
places/ building from chassis upwards etc) - though I have yet to try
and see how much of the wagon I can fix without at least pulling over to
the side of the road ;-)

Meanwhile ... back at the topic,
Have a look at the quality of the sinewave output of the inverter.
Many inverters use a very crude stepped quasi-sinewave which could freak
out some PC power supplies (or at the very least cause some irritating
whining and whistling from the supply). Also, since the voltage is
being stepped up by a factor of 20 or so then the current going into the
inverter will be huge. Huge currents mean huge magnetic fields mean huge
data loss from magnetic media. Careful how close to the inverter, you
fit the PC.

Hey, just had a thought (and too bone idle to see if anyone else in the
thread has mentioned it)... Your peripherals will use 12V,5V and 0V and
your mobo will use a variety of fixed value regulated dc voltages. Is
there no project out there to turn the 13.6V car battery into all the
voltages you need without ever going through the a.c. stage at all?

I'm sure a few 7812, 7809, 7805's and some zener diodes will give you
all you want.

Hmm, maybe my first million is in the oven.




--
Andy Richardson <[email protected]>
99% of Linux users moved away from Windows
99% of Windows users don't know there's a choice

Andy Richardson wrote:
> Huge currents mean huge magnetic fields mean huge
> data loss from magnetic media.

Only if huge current is wrapped around by huge numbers of turns.

>
> Hey, just had a thought (and too bone idle to see if anyone else in the
> thread has mentioned it)... Your peripherals will use 12V,5V and 0V and
> your mobo will use a variety of fixed value regulated dc voltages. Is
> there no project out there to turn the 13.6V car battery into all the
> voltages you need without ever going through the a.c. stage at all?
>
> I'm sure a few 7812, 7809, 7805's and some zener diodes will give you
> all you want.

And the negative rails ?
;-)

Steve

There are PSU's available which will supply an ATX connector from 12v dc (
includes -rail)
they come in at around £60 though

"Steve Taylor" <[email protected]> wrote in message
news:[email protected]...
> Andy Richardson wrote:
>> Huge currents mean huge magnetic fields mean huge data loss from magnetic
>> media.
>
> Only if huge current is wrapped around by huge numbers of turns.
>
>>
>> Hey, just had a thought (and too bone idle to see if anyone else in the
>> thread has mentioned it)... Your peripherals will use 12V,5V and 0V and
>> your mobo will use a variety of fixed value regulated dc voltages. Is
>> there no project out there to turn the 13.6V car battery into all the
>> voltages you need without ever going through the a.c. stage at all?
>>
>> I'm sure a few 7812, 7809, 7805's and some zener diodes will give you all
>> you want.
>
> And the negative rails ?
> ;-)
>
> Steve

StaffBull wrote:
> There are PSU's available which will supply an ATX connector from 12v dc (
> includes -rail)
> they come in at around £60 though


....and they're switch-mode PSUs, not linear ones made from 7812 and 7805...

Steve

Steve Taylor wrote:
> And the negative rails ?
> ;-)
>
> Steve

I guess you'd need a few 7660, a luvly little 8pin chip. you provide the
+ve voltage, it inverts it for you... among other functions.
gorgeous!


--
Andy Richardson <[email protected]>
99% of Linux users moved away from Windows
99% of Windows users don't know there's a choice

Steve Taylor wrote:

>
> Only if huge current is wrapped around by huge numbers of turns.

Buggar!
you're right there, I was still thinking big transformers. :-(
Perhaps fast switching of big currents?

OK ok, no more smug-mode.


--
Andy Richardson <[email protected]>
99% of Linux users moved away from Windows
99% of Windows users don't know there's a choice

Andy Richardson wrote:
> Steve Taylor wrote:
>
>> And the negative rails ?
>> ;-)
>>
>> Steve
>
>
> I guess you'd need a few 7660, a luvly little 8pin chip. you provide the
> +ve voltage, it inverts it for you... among other functions.
> gorgeous!

Oh Aye, maximum o/p current about 40mA, and dreadful regulation....

Steve

Andy Richardson wrote:

> Perhaps fast switching of big currents?

Tends to lead to RF noise, from ringing edges, fast changing mag.
fields, high induced voltage transients ? That what you're after ?

Steve

On or around Thu, 28 Oct 2004 22:44:16 +0000, Andy Richardson
<[email protected]> enlightened us thusly:

>I'm sure a few 7812, 7809, 7805's and some zener diodes will give you
>all you want.

should work, provided the current capacity of the 78xx are sufficient.

ISTR that some bits of PCs run -5 and -12V, but that should be possible.
might not be quite so easy, but there may be a regulator which does it.

dunno how much current it all takes, mind.

Austin Shackles wrote:
> On or around Thu, 28 Oct 2004 22:44:16 +0000, Andy Richardson
> <[email protected]> enlightened us thusly:
>
>
>>I'm sure a few 7812, 7809, 7805's and some zener diodes will give you
>>all you want.
>
>
> should work, provided the current capacity of the 78xx are sufficient.
>
> ISTR that some bits of PCs run -5 and -12V, but that should be possible.
> might not be quite so easy, but there may be a regulator which does it.
>
> dunno how much current it all takes, mind.

A 7805 won't handle more than 3A - and that might need heroic
heatsinking, or an extra radiator on the front.
You can't GET -ve supplies from a +ve one with a linear method.

Steve

On Mon, 25 Oct 2004 16:55:40 +0100, Mother <"@ {m} @"@101fc.net>
wrote:

>
>Been here... It's reasonalby easy to keep the o/s on an eprom chip
>(or memory that can be made bootable). Given some of these USB memory
>stick jobbies are now available for around a 100 quid for 2gig - you
>could easily have something you could remove from the vehicle without
>too much hassle for security reasons too.

Probably too techy for me, I asked about it here but shied away. I
ended up with an IBM laptop with 133Mhz pentium running some old
navigator software and a 1:250000 OS licensed bitmap.I connect this to
a Garmin 12xl which I carry when walking.

The 150W modified square wave inverter powers it all up but I cannot
help thinking there must be a way of simply dumping the (extinct)
10.5V battery and using the 12V vehicle electrics, doing away the
inverter. Wouldn't a couple of hefty diodes drop the voltage from
14.5V when running safely?

AJH

[email protected] wrote:
> Wouldn't a couple of hefty diodes drop the voltage from
> 14.5V when running safely?

No.

Steve

On Fri, 29 Oct 2004 22:11:05 +0100, Steve Taylor
<[email protected]> wrote:

>[email protected] wrote:
>> Wouldn't a couple of hefty diodes drop the voltage from
>> 14.5V when running safely?
>
>No.


Any relatively easy way around the problem? I think the mains adapter
puts out 18V. So to take 14.5V dc, convert it to 230V ac and then to
18V ?? to replace a 10.5V dc Lion battery is a bit tortuous.

AJH