XPost: sci.physics, sci.electronics.design   
   From: henry@spsystems.net   
      
   In article <364fd697.0411211011.324df030@posting.google.com>,   
   David Harper  wrote:   
   >The other method is to have a sheilded field of, say, X by X   
   >photocells and a single opening centered over it.  This method is much   
   >more "coarse", expensive, and harder to make, but less suseptable to   
   >non-solar radiation.  I'm aware that most "non-amateur" sun sensors   
   >use CCDs instead of photocells, but I believe that is a little beyond   
   >my experience (and budget).   
      
   The new CMOS imager chips are much easier to deal with than CCDs -- for   
   example, they have on-chip A/D conversion, so the outside interface is all   
   digital -- and also, if memory serves, quite a bit cheaper.  Their imaging   
   performance isn't as good as CCDs, but for seeing the Sun that's not   
   important.   
   --   
   "Think outside the box -- the box isn't our friend."    |   Henry Spencer   
                                   -- George Herbert       | henry@spsystems.net   
      
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