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'[EE]: Power supply for HD from car battery'
2000\08\02@095451 by wzab

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Hi All,

I'd like to use my "digital camera mass storage" in my car.
However HD requires two voltages: +12V and +5V, while car battery supplies
from +11V to +14V. There is no problem with +5V, but how to get the stable
+12V? Does it really require DC/DC converter?
Maybe typical HD's (Caviar, Seagate) can work with such unstable "+12V"
voltage?

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2000\08\02@122049 by Byron A Jeff

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>
> Hi All,
>
> I'd like to use my "digital camera mass storage" in my car.
> However HD requires two voltages: +12V and +5V, while car battery supplies
> from +11V to +14V. There is no problem with +5V, but how to get the stable
> +12V? Does it really require DC/DC converter?
> Maybe typical HD's (Caviar, Seagate) can work with such unstable "+12V"
> voltage?

How about a different suggestion. Consider using a 2.5 in laptop hard drive.
It's smaller and only requires 5 V. The somewhat difficult problem is getting
a 2mm cable for it. But suppliers like Digikey carry them.

It'll create a smaller, lighter, lower power solution than the 3.5 in standard
HD.

BAJ

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2000\08\02@215030 by McMeikan, Andrew

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I step up to 15v then reg down to 12v very stable, DC/DC is not that hard to
do, mine was high power for running old PC hardware but the datasheet
designs (very simple) should do ok for you.

My website is at http://www.opendesign.cx

       cya,    Andrew...

PS:can anyone help with building a submarine?  money/skills wanted

> {Original Message removed}

2000\08\03@191907 by miked

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> > > Hi All,
> > >
> > > I'd like to use my "digital camera mass storage" in my car.
> > > However HD requires two voltages: +12V and +5V, while car battery
> > > supplies from +11V to +14V. There is no problem with +5V, but how
> > > to get the stable
> > > +12V? Does it really require DC/DC converter?
> > > Maybe typical HD's (Caviar, Seagate) can work with such unstable
> > > "+12V" voltage?
> >
> > How about a different suggestion. Consider using a 2.5 in laptop
> > hard drive. It's smaller and only requires 5 V. The somewhat
> > difficult problem is getting a 2mm cable for it. But suppliers like
> > Digikey carry them.
> >
> > It'll create a smaller, lighter, lower power solution than the 3.5
> > in standard HD.

You can buy adapters that plug into laptop HDs and have a standard IDE
and power plug.

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