Re: TI-H: Power supply fot TI

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Power supply fot TI
From: Damien <reaper@tir.com>
Date: Wed, 06 Aug 1997 20:10:26 -0400
References: <19970806224753.21735.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org

Richard Piotter wrote:
> 
> Hello, I'm Richard Piotter an I am working on a TI power pack that
> would
> let you run a TI calculator off of a wall outlet so you don't waste
> your
> batteries. I found that using a 4.5 volt adapter is best, since it has
> a
> bit more power than batteries and the voltage is closer since
> batteries
> drain anyway, but I have had problems with the memory getting erased
> if
> the power pack is either connected or removed while the calc is on
> (someone trips on your cord). I found a chip from MAXIM (I forgot the
> number but I might get it later) that automaticly switches between a
> power pack and batteries with little or no voltage dropping or
> surging,
> but I can only find a 3.3 or a 2.8 volt version. If anyone can find a
> 4.8 or 5 volt version, I would be very happy. I want to make a test
> circuit, and I can get almost any MAXIM chip free by requesting a
> sample
> of it, but I don't know if they have a 5 volt version, and if they do,
> I
> would need the number (MAX####).
> 
> If anyone can help, I would appreciate it! I think that such a chip
> would be the solution to the memory erasure problem.
> 
> I'm not sure if It'll fit in my TI-85 with all the stuff I've added:
>   Turbo (and YES the C9 removal WORKS  (-:  !!!)
>   SPinTerface port (for pluging in expansion cartridges)
>   regulated power supply (for powering cartridges)
> Who knows, maybe a 16 pin SO chip WILL have room!!!   (-:   :-)
> 
> Thanks to anyone interested in responding
> 
> Richard Piotter
> 
> e-mail: richfiles@hotmail.com
> 
> home page: <A
> HREF="http://www.geocities.com/SiliconValley/Lakes/5081/Richfiles.html
> ">The
> Richfiles</A>
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One question, what is a SPinTerface? I have never heard of it.

Follow-Ups:

Re: TI-H: Power supply fot TI

From: tsaimelv@pilot.msu.edu (Mel Tsai)

References:

TI-H: Power supply fot TI

From: "Richard Piotter" <richfiles@hotmail.com>