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???
04/23/09 19:53
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 		 #164815 - You could have explained that in the first place!
Responding to: ???'s previous message
So, you want to use this DAC to generate the test voltage to be applied to your relay?

And you have a non-linear driver between the DAC and the relay?

In that case, as Per says, you really should have an ADC at the relay to measure the actual voltage:
Save This Code


 +------+    +-----+    +--------+        +-------+
 |      |    |     |    |        |        |       |
 |      +--->+ DAC +--->+ Driver +---+--->+ Relay |
 |      |    |     |    |        |   |    |       |
 |      |    +-----+    +--------+   |    +-------+
 | 8051 |                            |
 |      |    +-----+                 |
 |      |    |     |                 |
 |      +<---+ ADC +<----------------+
 |      |    |     |
 +------+    +-----+

Then you don't have to mess about with calibrating the driver, nor worry about its stability and any effects that different relays might have on it...

List of 9 messages in thread
TopicAuthorDate
look up table for DAC            01/01/70 00:00      
   What's the difficulty?            01/01/70 00:00      
      look up table and DAC            01/01/70 00:00      
         Table only needed if non-linear            01/01/70 00:00      
         back to basics            01/01/70 00:00      
            DAC and look up table            01/01/70 00:00      
               Why non-linear?            01/01/70 00:00      
               WHAT???            01/01/70 00:00      
   You could have explained that in the first place!            01/01/70 00:00      

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