General > General Technical Chat
Howto date LEDS
Gyro:
Old Red GaAsP LEDs are worth keeping around for low voltage bias supply 'Zener' use. In measurements taken by Morgan Jones for his Valve Amplifiers book, he found that these LEDs (forward biassed) have a dynamic resistance of around 4.3R @ 10mA, compared to 6R for a 1N1418 1N4148 - and of course you would need three in series to achieve the same voltage (18R). True low voltage Zeners fare very badly in comparison, LEDs are much quieter too.
SiliconWizard:
I see the idea, but I'm curious about what you're going to get in practice. Obviously, the first step will be to get ahold of batches of LEDs from various periods and do some stats.
AVGresponding:
You could try hanging out in the same light-bars, choose one at the same wavelength as yourself, and put your best voltage forward
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