I recently purchased a nice wireless bluetooth miniature keyboard in order to control my computer and beamer from the couch. There was a little problem, whenever it was dark i couldn't find the right keys on the keyboard! Thats why I installed a little Led lighting up the whole keyboard!
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The laser diode runs on 2.6 Volts. I unsoldered the diode and soldered some cables to the contacts:
After closing the keyboard and pulling the wire through a little whole I attached a little blue Led.