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???
07/24/09 14:04
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 		 #167819 - It is a differential amplifier...
Responding to: ???'s previous message
Farshid said:
But do you think that they were only trying to use this circuit as a filter, not as an adder/subtractor then ?

The scheme is full of mistakes, even the pin numbers of ADXL202 seem not to belong to this chip, so I really don't know what they actually tried to achieve. But the circuitry arround the "LM2924" should be two differential amplifiers, I think, like the upper one shown in this link

http://www.allaboutcircuits.com/vol_3/chp...t_8/9.html

It seems, that they subtract the filtered output signals of two ADXL202. The two caps shown in the scheme can be there to enhance stability, usually connected from inverting input to output of differential amplifier, and for additionally low pass filtering.

Kai

List of 24 messages in thread
TopicAuthorDate
Accelerometers as angle sensor, analog circuitry            01/01/70 00:00      
   Integrators ?            01/01/70 00:00      
      Seems to work with subtraction            01/01/70 00:00      
         There's no need to use two of them...            01/01/70 00:00      
   A bunch of baloney??            01/01/70 00:00      
      Shame it won't work.            01/01/70 00:00      
         You can compensate for centrifugal accelerations, but not...            01/01/70 00:00      
            How to use Accelerometers as angle sensors            01/01/70 00:00      
               Bloody hell, are you trying to solve this relativistically?            01/01/70 00:00      
                  The problem            01/01/70 00:00      
                     Could this be correct?            01/01/70 00:00      
                        Yes, if...            01/01/70 00:00      
                  Understood but the theird method...            01/01/70 00:00      
                     Upward and downward...            01/01/70 00:00      
                        Am I thinking in 2 Dimensions and you in 3D ?            01/01/70 00:00      
                           Centrifugal acceleration            01/01/70 00:00      
               What I wanted to tell...            01/01/70 00:00      
      Filter you guess then ?            01/01/70 00:00      
         It is a differential amplifier...            01/01/70 00:00      
            Schematics            01/01/70 00:00      
               Yes, but still looking funny...            01/01/70 00:00      
   Gyroscope            01/01/70 00:00      
      Gyro            01/01/70 00:00      
      Gyro ?            01/01/70 00:00      

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