Hi,
I'd like to change the four red/green LEDs on my CFA-635 for red/blue types. This is useful because the green LEDs are exactly the colour that gives problems to people with red/green colour sight issues; my father, for instance, is unable to tell the difference without having one of each to compare to.
I have found a supplier on Ebay offering 3mm red/blue LEDs, which appear to be pin compatible with those used on the CFA-635. I'm happy to do the changeout and accept responsibility for breaking the thing, but the question is to ensure that I can drive the blue die and that I won't damage the uC. I assume the blue die will have a higher voltage requirement than the green one would have.
It looks to me as if the LED drive strength is controlled by the eight resistors clustered around them, R21-R28; does the uC just drive 5V to these resistors and let them sort it out?
Thanks for any info,
P
I'd like to change the four red/green LEDs on my CFA-635 for red/blue types. This is useful because the green LEDs are exactly the colour that gives problems to people with red/green colour sight issues; my father, for instance, is unable to tell the difference without having one of each to compare to.
I have found a supplier on Ebay offering 3mm red/blue LEDs, which appear to be pin compatible with those used on the CFA-635. I'm happy to do the changeout and accept responsibility for breaking the thing, but the question is to ensure that I can drive the blue die and that I won't damage the uC. I assume the blue die will have a higher voltage requirement than the green one would have.
It looks to me as if the LED drive strength is controlled by the eight resistors clustered around them, R21-R28; does the uC just drive 5V to these resistors and let them sort it out?
Thanks for any info,
P
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