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David Brown
08/24/12 10:55
  08/24/12 12:02

Read: 458 times
Klamath Falls Oregon

#188155 - answers
Responding to: Erik Malund's previous message
I guess I've been a bit vague on some details. There will be an electrical room ~50 feet from the display. That is where the RS485 is going, and where the power for the display is coming from. To add an isolator to the RS485 lines, I'll need another circuit board there, since it doesn't make sense to put the isolator in with the display. If I have another board there, I may as well isolate the 12v supply to the display as well. (right?) Although, the electrical room will already have the GFCI breakers and whatever stepdown transformer & regulator to go from mains to DC, so do I really need the 12v supply isolated? For that matter, do I really need to isolate the RS485?

I found the LTM8047/8 uModule that can do 0.44A output @ 12v. The LT3573 is a little better at almost 600mA@12v. Edit: Found a circuit for the LT3748 that can do 2.5A@12v.


List of 22 messages in thread
Designing a product for use in water      David Brown      08/21/12 17:39      
   Have you considered silicone coating?      Richard Erlacher      08/21/12 21:11      
   one link      Stefan KAnev      08/21/12 22:04      
   Waterproof enclosures      Oliver Sedlacek      08/22/12 02:12      
      Projective touch - or maybe waterproof tablet      Per Westermark      08/22/12 06:27      
         If that potentiometer wasn't a hard requirement      Erik Malund      08/22/12 08:00      
            more details      David Brown      08/22/12 10:54      
               You might want to look into that a bit further      Richard Erlacher      08/22/12 13:33      
                  buttons for up/down gives tactile feedback      Per Westermark      08/22/12 14:12      
                     nevertheless, a strobe wheel rather than a pot ...      Richard Erlacher      08/22/12 15:24      
                        more good ideas      David Brown      08/22/12 16:42      
   Go to the lowest practical voltage      Jim Granville      08/22/12 16:20      
      answers      David Brown      08/22/12 17:39      
         Electric shock and intrinsically safe      Oliver Sedlacek      08/23/12 02:11      
            Isolators      David Brown      08/23/12 19:13      
               a question and a reference      Erik Malund      08/24/12 07:05      
                  answers      David Brown      08/24/12 10:55      
                     tethered unit??      Erik Malund      08/24/12 12:12      
                        mounted display      David Brown      08/24/12 12:32      
                           have you considered a combination of battery and solar?      Richard Erlacher      08/24/12 14:56      
                              indoor pool      David Brown      08/27/12 10:24      
                           Wireless chargers      Oliver Sedlacek      08/27/12 15:30      

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