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Recent content by fatpo

  1. fatpo

    Advise on this circuit

    Thats right about the temperature and how it affects the signal, but thats also why I filter out the DC offset so that only the changes pass through. By this way I amplify only the changes, which is then added to a self-made offset at 1.5V (Vref). Im aware of the drifts of different types such...
  2. fatpo

    Advise on this circuit

    I've earlier posted some threads about gyros. Finally I can concentrate on this. I use a gyro from Nec Tokin and managed to set up this circuit: The gyro gives (when still) a signal at app. 1.3[V] and in motion +- 0.3[V]. First the signal goest through a HP filter with a large tau-time...
  3. fatpo

    Importing and plotting ASCII file

    I have a ASCII file with measurments of a signal. I want to import the data in Matlab and plot the resulting curve. The thing is that the file contains at least 100k values. I wonder if Matlab has any limitation problems with this? I tried this: ------------------------------ clear all; global...
  4. fatpo

    accelerometers

    Hi jim, I'd be great ?f i had a job at all :D ... I'm on my 22 and just graduated from KTH in Sweden (E.E)...and looking for intresting jobs...right now I'm in turkey and enjoying the summer...the project will be continued when i'm back... however thanks for your answers. be sure to get back...
  5. fatpo

    accelerometers

    Jim, do you have anything that you can share with me (anything)? Actually, i'm more intrested in the "yaw" rate. It seems that, as you mentioned, these things are used in military purpose...its too bad that they dont put it on the net :(
  6. fatpo

    accelerometers

    Hmm...could you be more specific? (post some links btw...)
  7. fatpo

    accelerometers

    Is it possible to calculate the angular velocity using only accelerometers? It can be done with gyros, but i want to implement it with accelerometers, maybe combine 2-3 or them i same application...is the any way?
  8. fatpo

    OP amp question

    The drift is something that comes over time. The drift over temp. is another problem :) Do you mean like this? http://hem.bredband.net/yuspoy/gif2.gif
  9. fatpo

    OP amp question

    Observe that the values on the schematic are NOT real values. I just draw that to show how i thought! The real values for C6 and R6 are 11uF and 200K.
  10. fatpo

    OP amp question

    Its about a gyro sensor. Of course i can change the RC constant but it will amplify the changes of the 2.43 signal. What i want is that only the changes gets amplified so that the sensor will be more sensetive. Could you be more specific regarding the differentiator or integrator? I have no...
  11. fatpo

    OP amp question

    I'm not that good in analog electronics. felixc and cbarn24050, could you draw an example schematics? I'd be great. Right now i´m using the following in order to get the 2.43V signal. But i have no idea how i can continue from here. http://hem.bredband.net/yuspoy/gif.gif
  12. fatpo

    OP amp question

    The frequensies are between 0.5-20 Hz only
  13. fatpo

    OP amp question

    I have a DC signal at 2.43V from a sensor. I want to amplify only the changes around this 2.43 signal. When the signal's not "changing" it'll go back to the level (2.43V). I tried first with just feeding the OP with a 2.43V offset but the problem is that the original signal at 2.43 is changing...
  14. fatpo

    Filter design

    Allright. They're trying to combine the slow characteristics of the inclinometer and the fast characteristic of the gyro to determine a motion's(velocity) orientation. Since inclinometers work "best" with slow motions, and gyros with fast, they filter these signals to fit, or supplement, with...
  15. fatpo

    Filter design

    I need some help with a filter design. Its about filtering the output signals from a accelerometer and a gyro. If look at http://hem.bredband.net/yuspoy/filter.pdf (page 3) you see the filter suggested there. How can I build one with the same characteristics as in the pdf document? Math isn't...
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