From: jrwalliker@gmail.com   
      
   On 10/02/2026 07:05, Bill Sloman wrote:   
   > On 10/02/2026 10:52 am, 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).   
   >   
   > The late Jim Thompson's MC1496 is a lot cheaper - if a lot nastier - and   
   > Digikey has it for $0.35 on cut tape.   
   >   
   > You'd probably need to trim out offsets to get any kind of accuracy for   
   > low level inputs. The MC1495, which was closer to a proper multiplier,   
   > is now obsolete.   
      
      
   Another possibility is the LM13700 which comes in a dual in line   
   package so it is easy to wire up.  You may need some extra   
   components around it.   
      
   https://www.ti.com/lit/ds/symlink/lm13700.pdf   
      
   John   
      
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