Re: TI-H: LED Backlight

Re: TI-H: LED Backlight

• To: ti-hardware@lists.ticalc.org
• Subject: Re: TI-H: LED Backlight
• From: Grant Stockly <gussie@alaska.net>
• Date: Thu, 28 Jan 1999 15:53:54 -0900
• Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
• Delivered-To: ti-hardware@lists.ticalc.org
• In-Reply-To: <002401be4ad4$8097b260$c9648ed1@vizzini.rdtech.>
• Reply-To: ti-hardware@lists.ticalc.org

>From: Grant Stockly <gussie@alaska.net>
>>>BTW. How are the new EL auto-on plans coming?
>>
>>There realy aren't plans needed.  Get the enable line from the onboard ram.
>>It goes low and another high when the sram is pumping power.
>
>
>I wouldn't be comfortable drawing 30+mA (and noisy at that) directly from
>the board, I don't know how much those components can source, and I wouldn't
>want to hook up the noisy inverter directly to it.
>
>Also, by using the unused capacitor pads I specify on my page you get
>the handy feature of being able to turn the backlight on or off simply by
>changing the contrast up or down one step.
>
>For those interested in using a backlight autoswitch but that don't know
>much about electronics, or don't care to do the work them selves, for
>whatever reason, step-by-step plans are very helpful.

Transistors don't source 30ma from the input...

:/

• Re: TI-H: LED Backlight
• From: "David Knaack" <dknaack@geocities.com>

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