From: pchung705@gmail.com   
      
   Online simulation of buck-boost converter DC-DC converter is ready.   
      
   Buck-boost DC-DC converter has special feature that output voltage is with   
   negative polarity, and absolute value of the output voltage can be either   
   higher or lower then the input voltage, depending on duty cycle.   
      
   http://www.cirvirlab.com/simulation/smps_buck-boost_converter_online.php   
      
   Read theory of operation:   
      
   http://www.cirvirlab.com/index.php/switching-mode-power-supply/1   
   0-buck-boost-converter-basics.html   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)