On Mar 1, 2004, at 10:21 pm, Graham Cox wrote:
LEDs almost never burn out - unless you stick an AA battery across them, that is ;-)
I don't recommend this. Though an LED has a voltage drop of about 1.2V (at least red and green ones do), and this is close to an AA battery's output, without current limiting it would be very easy to burn out the LED even if the battery has only a small amount of excess voltage. You MUST have a limiting resistor in there.
I can confirm Apple's button board has a limiting resistor in series with the LED (little black dooder at the top of the board above the LED).
Still does explain why it doesn't work, in fact it only makes matters more weird...
Anyone know the board's pinout and feed voltages?
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