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Brian Gaff Brian Gaff is offline
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Default Auto dimmer for LEDs

This sounds like a simple circuit charging up a capacitor to bias on a
transistor. The problem probably is that the settings used assume a lower
resistance load than the led. It depends if its using someform of feedback
to achieve the more smooth gradual illumination.
Brian

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The Sofa of Brian Gaff...

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"Dave Plowman (News)" wrote in message
...
Asking here in the hope someone has come across this and may have an
answer.

Car interior lights have an auto 'dimmer'. They do a graceful fade in and
fade out when switched on and off. On a Merc. Owner wanted some slightly
brighter lights so changed from tungsten to LED. The auto system still
does a graceful fade out - but sort of leaps to on, rather than fading up.
Later Mercs have got LED lighting which does fade in and out OK - but it's
not just a case of changing the module which on the later cars is part of
other things too.

On this model the module is stand alone, so would be possible to modify
it.

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*To be intoxicated is to feel sophisticated, but not be able to say it.

Dave Plowman
London SW
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