Re: [ATM] dew heater ..Resistive Paint

["Malcolm Macdonald" <toliman@wave.co.nz>]

----- Original Message ----- 
From: "Jerry Reddell" <jerry.p.reddell63@sbcglobal.net>
To: <atm@atmlist.net>
Sent: Saturday, January 01, 2005 12:05 PM
Subject: RE: [ATM] dew heater ..Resistive Paint




>
> It is not cheap and I don't know if one can purchase it in a 1 oz size. 
> The
> actual total resistance depends of the thickness, width and length of the
> painted stripe... A thin, narrow, long stripe makes a higher resistance.
> Thick, wide and short stripe give a lower resistance.  Application usually
> involves use of a template to control the thickness ( squege type
> application) or a template and empirically derived spray painting times 
> and
> motions...
>
> For a diagonal, I would expect one could just brush it on relatively thin,
> and let the external controlled current flow establish the wattage.
>
> Jerry Reddell
>
> -----Original Message-----
> From: Bob May
>
> In the electronics industry, there is a product that is called "resistance
> paint".  It isn't cheap as paint goes but it does an excellent job of
> providing a resistance to current flow just like a resistor does.  The
> interesting thing is that it is measured in ohms per cube.  Longer lines 
> of
> the paint make larger resistances while wider lines drop the resistance. 
> If
> you need more power then you scale the size of the patch up.

Jerry and Bob,

     Thanks for your replies. I wonder if it is available here in New 
Zealand. I will go shopping, armed with a printout of your replies, to prove 
to the glassy eyed sales people that such a product exists.

    Malcolm.




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