Re: TI-H: TI-86 Slowdown with EL backlight


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Re: TI-H: TI-86 Slowdown with EL backlight




Same problem hmmm, did you stick the inverter in the same place as on
your 85 on the web page.  You might try a couple of resistors in between
32 and 47, I can't remember what I used.  If you want me to, I'll open my
calculator, but frankly I'm too lazy to right now.   A choke is a coil,
right?

Later,

Sam Camp the scamp@bayou.uh.edu


>Alright, I installed a backlight in an 86 for the first time,
>and I've run into the slowdown problem.  The calc works fine
>if the backlight is off, but as soon as I turn on the inverter
>the calc drops to a much slower speed.  This is happening with
>new or old batteries, and does not appear to be effected by a 
>series resistor, which seemed to fix the problem in other 86s.
>
>I have tried several series resistances in the inverter supply
>line, including 10, 22, 32 and 47 ohms.  The slowdown is not
>effected at 32 ohms, and at 47 ohms the inverter does not come
>on.
>
>I rigged up a seperate battery supply and powered the inverter
>from that, with the calc running from its own battery supply
>and every thing worked as normal.  Linking the grounds of the
>two supplies immediatly slowed the calc.
>
>The only thing I can think of as a cause is noise that the
>inverter is causing in the power supply.  Bybass caps of
>100uf, 50pf and 2pf across the battery supply had no effect
>on the problem.
>
>I will attempt to get a 'scope in here so I can check things
>in more detail sometime this week, but in the meantime, can
>anyone suggest some more diagnostic procedures, or suggest
>some possable solutions?
>
>Thanks
>DK
>
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