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Amateur oscilloscope / USB generator (sound chip)

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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • About Author
    Anonymous
    Anonymous  
    Anonymous wrote 0 posts with. Been with us since 1978 year.
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  • #2 16833637
    wesoly wymiatacz
    Level 10  
    Value for money just great. Congratulations on a very successful construction.
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  • #3 16834590
    katakrowa
    Level 23  
    Cool cheap and looks effective. I had this Hantek so I suspect yours works better - maybe not this range, but still :-)

    However, I have a question, what is the use of an additional amplifier before entering the sound card?
    Could you please share the source code of your application - I saw that you were doing this in visual studio c ++?
  • #4 16834734
    meraks
    Level 1  
    I would like to say hello to everyone (first post).
    I have some doubts about the method of simplified calibration.
    The AC voltmeter shows the effective voltage.
    We calibrate the amplitude. It seems that only after taking into account the coefficient ?2
    we will get the correct calibration. Maybe I was wrong, so please explain.
    It is possible that the calibration procedure takes this fact into account.
    Best regards,
    SM
  • #5 16835484
    Anonymous
    Anonymous  
  • #6 16836261
    Anonymous
    Level 1  
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  • #7 16836334
    pawel-jwe
    Level 30  
    What about phase inversion of the signal through the sound card (MIC input)? I had this problem myself and it is quite common (supposedly it is a software issue - drivers, but I did not study this topic).
    In addition, in cheaper cards, the phase likes to break at the band boundaries, which additionally "spoils" the charts.
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  • #8 16836404
    Anonymous
    Anonymous  
  • #9 16837538
    Anonymous
    Level 1  
  • #10 16842093
    Anonymous
    Anonymous  
  • #11 16842151
    Freddy
    Level 43  
    Stop hanging the dogs on @goreckidiy :)

    According to the PWN dictionary: an oscilloscope is an instrument for the observation and measurement of electrical waveforms

    According to the wiki: Oscilloscope - an electronic device used to observe, imaging and study the dependence waveforms between two electrical quantities or other physical quantities represented in electrical form

    So no matter if the bandwidth is 20kHz or 10GHz - this is an oscilloscope
  • #12 16842635
    Anonymous
    Level 1  
  • #13 16843086
    Anonymous
    Anonymous  
  • #14 16843102
    Anonymous
    Level 1  
  • #15 16846315
    wesoly wymiatacz
    Level 10  
    Hey, not everyone can afford a device worth 1000+, and here it is cheap, simple and that it has disadvantages, as even super expensive gems will have them and that's it. After all, you can see a lot with the oscilloscope described above. And everyone can afford it.
  • #16 16856423
    kassans
    Level 32  
    Cool design! Can you describe how you removed the filters on your soundcard and where less were they?
  • #17 16857265
    Anonymous
    Anonymous  
  • #18 16857925
    kassans
    Level 32  
    I just have a stationary machine, I was thinking about a PCI sound card and they are more susceptible to modifications :)
  • #19 16858221
    Anonymous
    Anonymous  

Topic summary

The discussion revolves around an amateur oscilloscope and generator built using an external USB sound card, featuring a single channel oscilloscope with a maximum Vpp of 25V and a frequency range of 20kHz, and a generator capable of outputting 0-10V with frequencies from 20Hz to 20kHz. Users express appreciation for the low cost and simplicity of the device, while also raising concerns about its limitations, such as the lack of DC coupling and external triggering. Calibration methods and the impact of sound card specifications on performance are debated, with suggestions for using higher sampling rates (e.g., 192kHz) to improve accuracy. The conversation highlights the device's utility for hobbyists lacking access to professional equipment, despite its inherent inaccuracies and limitations compared to traditional oscilloscopes.
Summary generated by the language model.
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