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PC Scopes there are quite a number of scopes for the diy would you recomend one?

Discussion in 'Electronic Basics' started by dsaint, Jun 13, 2005.

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  1. dsaint

    dsaint Guest

    PC Scopes are getting popular online any experiences? would you recomend
    one? any additions for example to increase voltage input?

    -- Bernard

    *** Sent From/Enviado desde: http://groups.expo.st ***
     
  2. Bob Masta

    Bob Masta Guest

    Depends on what you mean by PC scopes. Do you
    mean a hardware gadget that interfaces to the PC?
    Or something that uses your existing sound card?

    As the author of Daqarta for DOS (and the upcoming
    Daqarta for Windows), I can say that sound card
    systems (like Daqarta) can never be a complete
    replacement for a benchtop scope, because they
    have limited sample rates that confine them to
    audio-range work. However, if you are doing
    work in this range they can be very useful for
    things like spectral analysis and synchronous
    signal averaging for noise reduction. These are
    things that are available on pricier benchtop scopes,
    but not on the entry-level models you are likely
    to find. So one approach is to get a cheap benchtop
    scope for high-frequency and digital work, and
    use a sound card system for audio work.

    With a sound card scope you can measure audio
    distortion better than many expensive benchtop
    units, simply because souond cards have 16-bit
    ADCs and many high-frequency benchtops and
    PC hardware add-ons are only 8-bit. It is *so*
    nice to be able to make tweaks to an amp or oscillator
    and watch what happens to the distortion as you
    adjust a pot in real-time.

    Another advantage of sound cards is that they
    make outstanding audio signal generators, both
    for things like the above distortion measurements,
    or just general testing. (You may want to check out
    my free DaqGen for Windows; it's only a signal
    generator, but it does all sorts of waveforms and
    modulation tricks.)

    One downside of sound cards is that they don't
    go down to DC. If you don't mind a little wiring
    job, you can make your own 8-bit "sound card"
    for Daqarta for DOS that uses the LPTX driver.
    This circuit is typically a handful of resistors that
    you plug into the printer port. It goes down to
    DC and samples at up to 50 kHz.

    As far as increasing the input voltage range,
    you can do that on any scope, either benchtop,
    PC add-on, or sound card, using voltage dividers.

    Best regards.





    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  3. dsaint

    dsaint Guest

    could you please send me more infor on this scope bob and perhaps if you
    have any links to other because i am really intrested in this and probably
    i\'ll build anyone i find because i am really intrested

    regards

    what i am mainly intrested is in more info about soundcard scopes their
    limits and voltages and parrallel port scopes the same info

    *** Sent From/Enviado desde: http://groups.expo.st ***
     
  4. mike

    mike Guest

    Server Error 500 on the above site.
    How does one reach it?
    Thanks, mike


    --
    Return address is VALID but some sites block emails
    with links. Delete this sig when replying.
    ..
    Wanted, PCMCIA SCSI Card for HP m820 CDRW.
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  5. dSaINt}S{

    dSaINt}S{ Guest

    site not working !
     
  6. Bob Masta

    Bob Masta Guest

    Sorry, just discovered that after I posted.
    I am hoping the Web host can fix it soon!

    Best regards,




    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  7. Bob Masta

    Bob Masta Guest

    It's back up now. Sorry for the inconvenience.

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  8. Bob Masta

    Bob Masta Guest

    The Daqarta / DaqGen site is back up. (Sorry for
    the inconvenience.)
    www.daqarta.com

    No links there to other sites.

    But there's lots of into there on Daqarta, including the
    complete Help system for the main program, plus
    each of the drivers. If you go to the downloads page
    and scroll down a bit to the driver section, you'll find
    the Help link for the LPTX driver. That has schematics,
    theory, and construction tips. There's info on how to
    set it up for desired input ranges.

    Note that Daqarta for DOS run only under real-mode,
    so you need Win9x or earlier; Win2K and XP won't work.
    (That's why I'm working on Daqarta for Windows!)
    In general, the LPTX approach is not suitable for
    Windows, which does not allow real-time operation
    like DOS does. So there will likely never be an LPTX
    driver for Daqarta for Windows... sorry!

    So, if you have a rel-mode DOS system and would
    enjoy a bit of construction, this might be a fun project.
    But it will never compete with a real hardware scope
    on anything except cost!

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  9. redbelly

    redbelly Guest

    For low-frequency stuff (<120 Hz), I recently learned of a cheap ($25
    U.S.) A/D converter. Details are here:

    http://www.dataq.com/194.htm

    The main features:

    Plugs into serial (RS-232) port of a PC
    4 voltage channels that handle +/-10 V
    20 mV resolution (not the greatest, but good for this price)
    60 / sec sampling rate for each channel, or combine all 4 channels for
    up to 240 samples/sec
    Software is included.

    The advantage of this over sound-card software is that it reproduces
    low frequency and DC signals. A disadvantage is the upper limit of 120
    Hz (when using 240 sample/sec mode).
     
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