On 18/11/16 12:25, Lee wrote:
On 17/11/2016 15:24, Dave Plowman (News) wrote:
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.


I wonder if the tungsten module is doing it by varying the voltage
whereas the LED one is PWM/current control?
Should be easy to check and then maybe knock up a voltage controlled
PWM? I note there are a few old school 555 designs for that


I could, but I wont. Not after Plow**** claimed I had never designed
anything in my life in practice.

He's such a ****ing expert, he can do it.


--
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
time as the State can shield the people from the political, economic
and/or military consequences of the lie. It thus becomes vitally
important for the State to use all of its powers to repress dissent, for
the truth is the mortal enemy of the lie, and thus by extension, the
truth is the greatest enemy of the State.

Joseph Goebbels