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Old 26th February 2011, 06:11 AM   #61
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Join Date: Feb 2004
Location: Silicon Valley
Well, been there, am doing that already in a parallel project ( an active cathode bias circuit with PNP Darlington + TL431). I haven't tried an LED array for cathode bias, so this project will employ a couple. I'm not really one for gaudy display, so I'm hiding my lights under a bushel and keeping the arrays out of sight. Since they're made using 1st generation GaAsP LEDs, they aren't all that bright to begin with, and ugly (construction-wise) to boot. I may use a prettier GaAsP LED (with ruby-red clear encapsulation) as a pilot, but I'm also biased towards some equally obsolete (though much more recent) SiC LEDs that are a rather fetching sky-blue, and will go well with the deep blue metallic paint I'll be using on the case. I have a feeling there won't be too much difference between an LED array (ohms of incremental impedance), and the active cathode bias (milliohms of impedance). Less experienced people will have an easier time getting the LEDs to function, as they can just string them together and not have to worry about loop stability for the bias circuit.
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