major repairs to drivetrain system!

[Fred Munro]

LEDs worked fine in the seat heater controllers in my UrS4, Brett. Identical
illumination to the OEM bulbs. I added a reflector to divert light into the
light guide.

Fred Munro
'94 S4

----- Original Message -----
From: "Brett Dikeman" <brett at cloud9.net>
To: "Brian Devlin" <bdevlin at stanford.edu>; <quattro at audifans.com>
Cc: <200q20v at audifans.com>
Sent: Thursday, February 14, 2002 7:16 PM
Subject: Re: major repairs to drivetrain system!


> At 3:47 PM -0800 2/14/02, Brian Devlin wrote:
> >>  but given that all of the switches
> >>I've taken apart so far have showed signs of the bulb burning the
> >>plastic, I don't think the 60mA version is such a hot(pardon the pun)
> >>idea.
> >
> >Sounds like a good place to put and LED.
>
> True, but the problem is that, among other things, LEDs usually have
> at most a 20-30 degree, cone spread; the bulb is 360, so light
> bounces off all the white sides etc of the box and you get a great,
> evenly lit diagram.  It might work here because of the distance
> between the light and the diagram, but, for example, things get
> trickier with the various switches because they use light
> guides(clear plastic) to bounce light around to all the switch pieces.
>
> It has occured to me that a PCB mounting, side-angled LED might work
> great for the light guides, but the problem is sizing and finding one
> that has a builtin resistor for 12v/14v operation.
>
> I'll try to get around to poking in Digikey's catalog for something
> that might work, while I have the switches all apart and can measure
> with the calipers for clearances etc.
>
> Positioning/beam spread is the very same reason no one has, as of
> yet, managed to adapt LEDs into the dash lighting of the older
> cars(to my knowledge.)  Every year or so the whole LEDs-in-dash
> thread gets fired up, nothing ever comes of it :-(
>
> B
> --
> ----
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