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signal conditioner

Discussion in 'Electronic Design' started by [email protected], Apr 18, 2007.

  1. Guest

    Hi guys,

    Iam trying to find a design for a conditioning amplifier "signal
    conditioner" to be used with a piezoelectric accelerometer. I need a
    gain of 20 dB and also need a BandPass Filter between 1KHz to 10-KHz.
    The signal has a low amplitude of millivolts. I need the signal
    conditioner to power the accelerometer.

    Here is the specs for the accelerometer:

    http://www.pcb.com/contentstore/docs/PCB_Corporate/Vibration/products/specsheets/352B_B.pdf

    and here is the specs for the signal conditioner that works with it (I
    need to design something like this myself :( ):

    http://www.pcb.com/contentstore/docs/PCB_Corporate/Electronics/products/specsheets/480E09_M.pdf

    This is what happens when you let a girl design electronics :)

    I would really appreciate your help guys!
     
  2. Have you looked at the application notes? This part already has an
    amplifier inside; the hard work is already done for you.

    http://www.pcb.com/techsupport/tech_signal.php
    What is it, some kind of fully-instrumented vibrator?

    Best regards,
    Spehro Pefhany
     
  3. John Larkin

    John Larkin Guest

    Tasteless. Why does somebody always say something offensive whenever a
    woman posts here?

    John
     
  4. DaveC

    DaveC Guest

    What is it, some kind of fully-instrumented vibrator?

    If the OP was a guy, would you ask the same question?
     
  5. Guest

    This looks like fun. First off, you need to feed the sensor with a
    current source. In the app note, they use a current regulated diode,
    which is really a JFET. In this case, the IDSS has to be less than
    20ma. You could also design a current source using a PNP or P-fet
    This sensor has some decent high frequency respoinse, i.e. 15KHz. At
    best, the time constant associated with the 500ohm output impedance of
    the sensor and the load capacitance of the current source should be
    around 3uS., or 20nF. [Hey, I'm just whipping this stuff together, so
    check the math.] Any capacitance in the cable has to be subtracted, as
    well as loading capacitance of the amplifier.

    Since the charge amp is built into the sensor, all you would require
    besides the current source is some AC coupled amplifier, or DC coupled
    with a servo. The impedance of the amplifier (probably just an op amp
    in the negative gain configuration) and the coupling cap determine the
    low end response.
     
  6. You don't think that's what was intended in the original post?


    Best regards,
    Spehro Pefhany
     
  7. Possibly, I've been spending a *lot* of time around college kids the
    last little while.

    Here's *my* fully instrumented vibrator (also designed the actuator
    electronics):

    http://server2.hostingplex.com/~zstoretr/vib.jpg

    The only thing tasteless about it (and it's pretty tasteless) is that
    the product it produced was designed to produce is used to
    deliberately kill people.


    Best regards,
    Spehro Pefhany
     
  8. joseph2k

    joseph2k Guest

    Speaking strictly for myself, NO, not at all. If you had even brushed up
    against vibration or shock testing you could know better. I will read the
    rest of the thread before i answer OP.
     
  9. joseph2k

    joseph2k Guest

    I doubt that the sensor is piezoelectric, the specs read like a partially
    conditioned MEMS sensor. Proper piezoelectrics output dimensions is in
    picocolumbs per g.
     
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