Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
05/05/06 12:31
Read: times


 		 #115645 - I think this one has been missed
Responding to: ???'s previous message
I do not totally recall all that has been posted here, but I think one has been missed:
Differential communication!
I am not talking about the unbalanced differential (gnd and signal) which in my book is not 'differential' but simgle ended.

I have had success in applications where e.g. an electronic high/low was to be sensed with using a RS485 driver to convert the signal to differential. A properly selected RS485 chip can handle enormous amounts of common mode noise, if even more noise has to be handled there are floating RS485 drivers/receivers available.

DO NOTE: I am NOT talking about 'convering to communication' I just connect the switch to the input of a 485 driver and use a 485 receiver at the other end.

for Analog signals there is a plethora of differential solutions as well.

Erik

List of 50 messages in thread
TopicAuthorDate
Ground noise question            01/01/70 00:00      
   Chassis ground            01/01/70 00:00      
      measure what?            01/01/70 00:00      
   Shielding            01/01/70 00:00      
   I think mutual ground will be better            01/01/70 00:00      
   Ground noise            01/01/70 00:00      
      I'm with you.            01/01/70 00:00      
         the situation is like this            01/01/70 00:00      
            Try this            01/01/70 00:00      
               Disconnecting of battery while welding            01/01/70 00:00      
      Cures...            01/01/70 00:00      
         Shielding            01/01/70 00:00      
            Old tradition            01/01/70 00:00      
               New traditionalists            01/01/70 00:00      
                  What I want to tell...            01/01/70 00:00      
   Chassis connection makes sense            01/01/70 00:00      
      Not convineced!            01/01/70 00:00      
         Consultants ?            01/01/70 00:00      
            mmm            01/01/70 00:00      
         I don't know much about your application            01/01/70 00:00      
            I think this one has been missed            01/01/70 00:00      
               Differential, symmetrical...            01/01/70 00:00      
               Brilliant!            01/01/70 00:00      
               What about current loop?            01/01/70 00:00      
                  Concept            01/01/70 00:00      
                     Injecting signal into gnd            01/01/70 00:00      
                        Insufficient common mode rejection.            01/01/70 00:00      
                           Go differential            01/01/70 00:00      
                        That's why...            01/01/70 00:00      
                           in other words            01/01/70 00:00      
                              Split ground            01/01/70 00:00      
                           So, how do you maintain a "clean" GND?            01/01/70 00:00      
                              There's no golden rule!            01/01/70 00:00      
                                 back to the future            01/01/70 00:00      
                                    make you happy!            01/01/70 00:00      
                                       write a c code in keil 2 operate e timer            01/01/70 00:00      
                                          Err ?            01/01/70 00:00      
                                             so sorry...            01/01/70 00:00      
                                          what is Keil 2?            01/01/70 00:00      
                                             Trying SMS style?            01/01/70 00:00      
                                                naah, just early morning, fingers stiff            01/01/70 00:00      
                                 More thought            01/01/70 00:00      
                                    Crazy            01/01/70 00:00      
                                       Yes thank you            01/01/70 00:00      
                                    Eh??            01/01/70 00:00      
                                    Common mode noise of DC/DC-converters            01/01/70 00:00      
                                       why use isolated converters?            01/01/70 00:00      
                                          Exactly!            01/01/70 00:00      
                                             air craft chassis            01/01/70 00:00      
                                                Faraday cage ?            01/01/70 00:00      

Back to Subject List