From: BobEngelhardt@comcast.net   
      
   I bought one of these 24v DC motor controllers:   
   https://www.ebay.com/itm/311703088756   
   It came with zero documentation.  I found the basic connections on the   
   web, but nothing else.   
      
   My question here is: it takes 12-24v DC in and with just a variac and   
   bridge rectifier, it works.  But would it work better with a regulated   
   supply?  I'm guessing not because of its own big cap and PWM output.   
   But what do I know.  If regulated would be better, in what way?   
      
   I don't want to just add caps because it will have very intermittent   
   duty and the fully-charged cap voltage would be way over the   
   controller's rated 24v.   
      
   Thanks,   
   Bob   
      
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