How to Build a Cheap and Easy Measurement Rig

Discussion in 'Measurement Systems and Standards' started by OJneg, Feb 28, 2016.

  1. OJneg

    OJneg The Most Insufferable

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    The thing on the left is the mic, which I model as a two terminal device, red and black wire leads

    The wires that go nowhere are connected to common ground, which basically means you hook them all up together.
     

  2. spwath

    spwath Friend

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    OK, great thanks, I understand it all now
     
  3. JBoogie

    JBoogie Rando

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    [​IMG]
    is this correct? just wanted to check before I solder them to the board
     
    Last edited: Aug 15, 2016
  4. OJneg

    OJneg The Most Insufferable

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    Yessir. Assuming that's a 2N5551 with the flat side up.

    Another thing to note, you can connect the "output" to either Pin 3 or Pin 2 depending on if you want positive or negative polarity. I don't recall why I specified Pin 3 as I'm not sure if the WM61's electrical output corresponds to a compressive or rarefacting wave. You guys can check that for me. :)

    Added your pic to the first post.
     
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  5. JBoogie

    JBoogie Rando

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    would soldering point to point instead of using a pcb work the same?
     
  6. OJneg

    OJneg The Most Insufferable

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    You should try to keep the layout as tight as possible. A breadboard works well like I showed.
     
  7. spwath

    spwath Friend

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    Got my package, time to start building. Except I forgot an XLR connector and protoboard. And I dont have an audio interface.
     
  8. Gatucho

    Gatucho Rando

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    Hi,
    Do you have a suggestion for a replacement for the wm61 mic.the suggested at the beginning of the tread seems to have a reduced bandwidth. I can't find an authentic wm61 and others have worse specs and/or frequency response
     
  9. HappyMonkey

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    thank you great thread, but i am already over my head :) can you point me out in some direction or thread where i can learn about reading measurements something like measurements and measure gear for dummies so i can catch up with many threads here on SBAF :)
    I have emu 1212m and two shure microphones and one sony shootgun camera mic would that work for measuring. Thank You
     
  10. Marvey

    Marvey Loves sex and records

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  11. HappyMonkey

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  12. Valolilol

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  13. HappyMonkey

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  14. Kattefjaes

    Kattefjaes Mostly Harmless

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    A great thread, thanks for posting it!

    I have been having a go.. here are some terrible phone pictures...

    The circuit board:

    (Full disclosure, not my very neat layout.. someone else did a better job for me!)

    [​IMG]

    The circuit board hidden in a little bulb inline, XLR plug and mic:

    [​IMG]

    Doing a quick "how does REW work?" test.. Using firm upholstery foam, and then Creatology-style foam on top, with the mic pushed through the middle from the back. (Not pictured, large and extremely thick hardback book on the other side of the foam!):

    [​IMG]

    ..and quick and dirty output, probably with everything set wrongly, in a noisy room.. with someone asking "why does it make that noise" every time it did a sweep:

    [​IMG]

    Clearly I need to learn what the hell I am doing still, but that does look faintly like an FR.. so I am encouraged. Thanks for the thread, @OJneg!
     
    Last edited: Dec 8, 2016
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  15. Priidik

    Priidik Friend

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    I could use some consumer advice:
    Which mic pre/soundcard is good bang for buck for measurement only applications?

    Are the EMM-6 and Sonarworks mic comparable in real world quality?
    200$/€ max for mic+pre!

    Thanks ahead!
     
    Last edited: Dec 1, 2017

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