Re: TI-H: Switchable Power Sourecs.
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Re: TI-H: Switchable Power Sourecs.
I'm sorry, I don't understand your question. Could you
elaborate/rephrase it. " And
how are you planning to turn somehtiing with and LED display into and 82
with
an LCD and probably totally different system architechture?"
~Larry C
Larry1492@juno.com
On Tue, 11 Nov 1997 08:32:08 -0600 (CST) Andy Muldowney
<andy@microcosm.world-net.net> writes:
>The switch is called a closed circuit switch. Normally, Two prings
>are
>touching, when you stick in the plug for an ac adapter, they
>disconnect.
>That cuts off the flow from the battery and uses the AC adapter. And
>how
>are you planning to turn somehtiing with and LED display into and 82
>with
>an LCD and probably totally different system architechture <sp>?
>-Andy
>
>On Mon, 10 Nov 1997, Larry G Currie wrote:
>
>> I have an old TI-1250 ( the 8 or 9 digit red bubble display, pixel
>LEDS,
>> not LCD) I disassembled for research purposes. It runs on NINE
>VOLTS!!!
>> HOwever it has an ac adaptor port that you can plug in W/ the 9V
>batery
>> in. The way it is wired is that negative goes to the board from the
>> 9VBatt. The AC input is where the Pos. from batt. connects.
>Evidently,
>> when the ac adaptor is not producing current, a switch is closed,
>> letting the 9Vbatt work. When the AC plug delivers curent/plugged
>in, it
>> opens the switch that the 9Vbatt used, dissabling it? I assume this
>is
>> how it works. It is the best I know from examining the wiring. Can
>> anyone elaborate? It would make it so much easier to build an AC/DC
>> powered calc. I have plans for a cool design resembling that of an
>'82
>> viewscreen model. If I ever get the web page up, and the other
>designs
>> drawn, I hpoe to draw it. Maybe next week...
>> (note: when I say "closed" switch, I mean current flows. "Open"= no
>> flow)
>> ~Larry C
>> Larry1492@juno.com
>>
>
>
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