[SunRescue] An intriguing idea...

[Mike Hebel]

Tim,

Yes I was referring to IPC/IPX/Classic style and like I said - it was just
an idea.  Although you do have a good point about the thermal properties of
the case - it gets quite warm after a long period of use.

What I actually was looking for was something that would handle small
brownouts and moving the system without having to move _all_ the systems on
the UPS or having to shut it down to move it from one outlet to the next - 5
feet away.

I've actually seen specs for several 24V batteries that would do just fine
for this sort of thing although you would have to completely cut out the
floppy bay to get the height. I don't think a 12V with a switching p/s would
fit in that case anyway.

On the subject of another disk - could you replace the floppy with another
drive and use a power "Y" to run both drives?  Would the supply support that
kind of load on the single feed or not?  (Maybe I'll try this tonight.)

I'm a hardware hacker at heart. ;-)

Mike

-----Original Message-----
From: rescue-admin at sunhelp.org [mailto:rescue-admin at sunhelp.org]On
Behalf Of Tim
Sent: Tuesday, April 11, 2000 13:09
To: rescue at sunhelp.org
Subject: Re: [SunRescue] An intriguing idea...


> Mike Hebel wrote:
>
> Here's an odd idea:   Using a voltage regulator and a 12V gel-cell or
> L-ion battery could you replace the floppy on cake-box systems to give
> them some power-redundancy?  The only thing I can see that would cause
> a problem is the POK signal but I'm sure that could be simulated.  (I
> know an external UPS would be easier but I like to do odd hardware
> hacks.)
>
> I'm sorry but I get these ideas from time to time and I have to share
> them otherwise I don't know if they're worth anything when I lose them
> again.
>
> Mike Hebel
by cake box do you mean IPC style?
Well..., I don't think you would get usable life out of it, those
machines aren't exactly green, and if it is running one of the older
disks, those things are power black holes.  If you had a software
interface, so it immediately did a clean shutdown, it might work, but I
doubt it would be worth the hassle, what do they need? +- 12, +5?
that's either a 24 volt batery and 3 regulators, or a twelve volt
battery and a switching supply, either of which would add heat to an
already thermally challenged case.

Just my opinion, but you'd be better off getting another case, or maybe
an 811 case, and building a matching external power supply.  You could
actually take the supply out of the computer, whic would help with heat,
and build the supply and battery back up in a separate, matching,
stackable box.  You probably could get another disk in the computer
also.

Tim
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