From: christopher@librehacker.com   
      
   piglet  writes:   
      
   > If high precision is not needed and only LF response is enough then I   
   > have used PWM techniques:   
   >   
   > Circuit A is the basic squaring concept, relies on modern open-drain   
   > output comparators being pretty good switches to ground. Assumes you   
   > already have a source of sawtooth or triangle waves with defined zero   
   > and peak values in the system.   
   >   
      
   Could you please explain better how the PWM squarer circuit works? It   
   look like it would be easy to build, but I don't grasp what is going on.   
      
   --   
   Christopher Howard   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)