As the requirement is for a few milliamps it appears that All Electgonics has 
an inexpensive DC DC converter 
http://www.allelectronics.com/make-a-store/item/DC-32/DC-DC-CONVERTER/-/1.html  
that runs off of +5v.  All I have to do is to run the -19v output throught a 
negative regualtor and its a done deal.


      

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