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Originally Posted by XTC
I suppose a matrix of very small LEDs would be close.
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Hmm... a circular array of the very small surface mount 'chip' LEDs driven from some sort of microcontroller (there are some with an ADC) programmed to PWM the last LED lit. So, rather than a step change from one LED to the next you get a gradual increase in brightness before the next one lights...
I might add that to my project list
Regards, Kat