XPost: sci.electronics.components, sci.electronics.design   
   From: not@home.cow   
      
   > What is the load?   
      
   Electromagnet.   
   > What characteristic are you looking for and why?   
      
   > Tim   
      
   ? I want to “levitate” a metal object by sensing its altitude and varying   
   the strength of an overhead electromagnet. I’ve already got the micro   
   handling altitude sense and putting out pwm relative to height (zero   
   duty-cycle = on the table).   
      
   I know there’s other designs but I am doing this as a learning exercise and   
   have already done half the design (micro&software).   
      
   Thanks.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)