Re: TI-H: about one thing...

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: about one thing...
From: Grant Stockly <gussie@alaska.net>
Date: Fri, 2 Oct 1998 16:43:18 -0800
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19981002164641.1069.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org


>>From: StoryTelr Jedi Knight <storytelr@yahoo.com>
>>well thanks anyways,ya i guess a PCCDROM thing would not need shock
>>resistance, .... oh well, just wanted to see that.  but what if you
>>used power transformers to up the volts on battery power????.
>
>It only needs +/-5 and +/-12 volts (and you may be able to
>drop one or more of those, many devices only use a couple),
>so you could do it with 8 batteries, or if you wished you
>could use a DC-DC converter to raise the  voltage from
>fewer batteries.
>
>Either way you're going to be pulling quite a bit of power
>from the batteries.  CDROMs are not designed to be very
>power efficent, as they are intended to be connected to
>an unlimited supply (ie, the wall socket).  A laptop
>CDROM might be better, and may have a little better
>shock resistance too, not to mention being smaller.
>
>Most battery manufacturers websites have at least Ah
>ratings for their batteries, and some even have discharge
>curves.  Check your CDROM for its power requirments
>(usually printed on the drive), and calculate how
>fast it would eat batteries.

You only need GND for CDROMS.  not - voltages...

References:

Re: TI-H: about one thing...

From: "David Knaack" <dknaack@hotmail.com>