Re: [ATM] low voltage heating elements.

[Ken Lowther <hermit@outofoptions.org>]

I used that cirucit, also available here:
http://www.atmsite.org/contrib/Clement/newdewheater/

I used a free pcboard layout software program to lay out the circuit:
http://www.atmsite.org/contrib/Clement/dewheater/pcb/index.html

Bill Prewitt  used the masks to etch circuit boards and  made several each.
They work.  We demoed them at an astronomy club meeting.

If enough folks are interested, this is the kind of project that is 
easier as a
group.  There is a single mask and a 'six pack' designed to fit on a standard
board.   Bill and I used the 'six pack' and cut them up.

Ken Lowther


Quoting Don Clement <clement.focuser@verizon.net>:

>> I was wondering if anyone knew a source
>> for low voltage heating elements for dew zapping.
>>
>> I'm thinking cheap here.
>
> Here is low voltage DIY circuit that automatically keeps optics a small
> amount above ambient and minimizes wattage, battery life, and the effect on
> seeing. http://mysite.verizon.net/res0owmd/id1.html Cost is about $10 in
> parts.
>
> For the heating element, one could use a series/parallel distributed
> combination of off-the shelf resistors (axial lead or SMT) , nichrome wire,
> constantan wire  that can be soldered (available from
> http://www.omega.com/ ) , or make up your own paint-on conductive coating
> using graphite powder and paint or RTV.
>
> Don Clement
> Running Springs, California
>
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Hermit, holed up in Youngstown, Ohio
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