TI-H: Indiglo Backlight

To: ti-hardware@lists.ticalc.org
Subject: TI-H: Indiglo Backlight
From: "Richard Piotter" <richfiles1@hotmail.com>
Date: Wed, 11 Feb 1998 09:52:38 PST
Reply-To: ti-hardware@lists.ticalc.org


Fine, tell me where to BUY an inverter that runs on 6 volts, is designed 
to run an EL panel, and FITS inside of a calc. The indiglo inverter is 
the perfect choice. It runs on 1.5 volts, runs a decent sized indiglo 
panel (about 1 square inch), and doesn't KILL the batteries. yeah, I may 
need to alter the values a bit to run on 6v, but believe me, the size of 
the panel does not make a drastic change. Besides, the 4 AAA batteries 
produce way more current than a tiny 1.5v watch battery.

I have the skills to do it, and it'll be cheaper and more efficient to 
build one designed specificly for the EL panel. A little redesing here, 
a different value there, and I'll have the brightest TI in the western 
hemisphere! I intend to look for an indiglo watch today. I had one 
yesterday, but it was mechanical quartz driven and I was only allowed to 
look, not break. I need to find a digital one. It'll be easy to 
dissasemble it!

Richard Piotter
richfiles1@hotmail.com

>
>
>> I mapped out the TI-85 schematic, so mapping out the schematic of the 
>> inverter in an indiglo watch should be a piece of cake! I may get an 
>> indiglo watch from K-mart when they go on sale, take it apart, and 
>> recreate the inverter. Then use a calc screen sized EL panel and see 
if 
>> I can drive it off of 4 AAA batts and see how long it runs!
>
>It is much easier to just buy an inverter. It is nothing more than an
>oscillator feeding a transformer anyway.. Besides, The inverter circuit 
in
>an Indiglo watch would need to be slightly redesigned due to the higher
>current requirements of a larger EL panel. 
>
>-- 
>Greg Hill
>greg-hill@bigfoot.com
>www.comports.com/link
>
>
>


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