On Tue, 6 Jan 2004, Alan B. Pearce wrote:
> Well I have been seriously thinking of mounting some "concrete block" or
> aluminium cased power resistors on the back (well surface to the front of
> the car) of my wing mirrors and hooking them into the back window heater
> circuit ... I reckon a watt or two per wing mirror should be heaps.

I'm planning something like this too. The existing heated mirrors in my
car worked by having a thin plastic film with two spade terminals at the
end and a grid of conductive material covering the film. It says "12v
15W" on it, although the resistance between the terminals is just over
8 ohms. I want to replace mine though because the conductive material is
peeling off the two outer layers of plastic film, and if it comes
completely off, the mirror will fall out.

I've made some pcb's with a similar grid pattern on them, and plan to glue
them to the back of the mirror, then glue that to the base the mirror
glass sits in, to where the existing plastic film is. The cables are
already there to provide it with power, so I'll just need a pic with a
misted-glass sensor to control it :)

HTH,

Tim

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