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 Post subject: backlight control with a switch?
PostPosted: Tue Oct 17, 2006 10:08 am 
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Joined: Tue Oct 17, 2006 9:59 am
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I'm intergrating my Deck into a device, and would like to have control over the LED's. I noticed a pair of transistors at the bottom of the board near the spacebar button. Do these control the LED's? What I'm looking for is a trace or comonent where I can wire a simple SPST switch into.


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 Post subject:
PostPosted: Wed Oct 18, 2006 1:11 pm 
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We're not ignoring you! :D I have been looking into this for you, however, the design engineer has been out of town so I'm still waiting for an answer. ....Deck Girl Amy


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PostPosted: Tue Oct 24, 2006 9:59 am 
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It's ok, I can be patient. Thanks for checking this out for me!


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 Post subject:
PostPosted: Wed Oct 25, 2006 8:45 am 
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Joined: Tue Aug 09, 2005 1:48 pm
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Location: Kenosha, WI
Hi mopar300m,

I have spoken with our engineer and in a nutshell this is what I have been told:

If you plan on integrating the board into a device so that the device controlls the board, we can't really help you with that because we do not reccomend it, especially if it is a blue or green board. Our main concern is that the blue and green boards already draw nearly 500mA, which is right at the spec'd limit for USB drives. We are uncertain how much the board would draw depending on how you wire up your switch or what you are trying to do with it and we don't want it to not work for this reason if you modify it this way. So although we dont suggest you do it, you still can. Here is a picture of the two transistors you would need to work with:

Image

Also, here is the schematic for the Legend keyboard to help you with your mod.

What I have been told is that you need to wire your switch to the outer legs of the transistors, and clip the inner leg on both transistors or the board will retain control of the dimming functions. If this isn't what you want to control, then I am not sure what you can do but that is what the schematic is for.

Hope that helps, good luck!

_________________
Deck Guy Adam
http://www.deckkeyboards.com - The best backlit keyboards on Earth
http://www.tg3electronics.com - Parent company of Deck, leaders in custom industrial keyboards


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