From: antispam@fricas.org   
      
   Christopher Howard  wrote:   
   > Hi, I was wondering what is the cheapest (and hopefully, simple to wire   
   > up) way to get an analog square function. I.e., input a voltage x, and   
   > get voltage x^2 out. Or x^2/10. Or some reasonable approximation of   
   > either of those.   
   >   
   > The standard trick is to feed the voltage into both inputs of a   
   > multiplier chip. But even those AD633 chips are tough to afford on my   
   > budget (around 20 USD each).   
      
   Standard apprach for low-accuracy approximation is diode-resistor   
   network.  But such network gets inpractically large if you need   
   good approximation.   
      
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