Check for errors before production

Discussion in 'The Projects Forum' started by Eirikki, May 29, 2016.

  1. Eirikki

    Thread Starter New Member

    Apr 30, 2016
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    Can you review this schematic to see if you can find anything that might cause a short or error or if there is any wrong wiring e.t.c.?
    Whould be much appreciated :)
    Sincerly, Eirik
     
  2. Eirikki

    Thread Starter New Member

    Apr 30, 2016
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  3. bushrat

    Member

    Nov 29, 2014
    97
    22
    Before you build this, you do realize that all of the BOM parts are SMT, right ?
    Building this with the exact parts provided is beyond of capabilities of 99% of EE students, unless you own a circuit manufacturing company..
     
  4. Eirikki

    Thread Starter New Member

    Apr 30, 2016
    9
    0
    Not all of them...
    and im gonna use a stencil and apply solderpaste myself, place components myself
    and reflow with a industrial (in line) reflow oven
     
  5. bushrat

    Member

    Nov 29, 2014
    97
    22
    For 6 years, i worked in circuit board manufacturing plant (Creation Technologies Inc), I seen how it's done.. If you are capable of doing it yourself, then you have a talent there..
     
  6. Eirikki

    Thread Starter New Member

    Apr 30, 2016
    9
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    Is it that difficult?
    0402 resistor:

    atmega 2560:

    other fine pitch:
     
  7. bushrat

    Member

    Nov 29, 2014
    97
    22
    It's possible, but the question is, have YOU done it before?
    Just because youtube shows how to do it, does not mean that you have the capability or knowlede to do it.. I seen a guy on youtube benchpress 500 lbs, can i do it too?

    R207 is a 0402 component.. picture taken by me under microscope. A penny to scale (I know, it's not a banana)

    [​IMG]
     
  8. SLK001

    Well-Known Member

    Nov 29, 2011
    817
    227
    You want US to do a checkplot for you? A checkplot is very tedious undertaking. My quick answer to you is learn how to do it yourself. Get yourself some colored markers, print out both a schematic and all layers of your PCB (use the PCB GERBERS). You will also need the datasheet of EVERY DEVICE on your board.

    First, check the schematic and the PCB for the correct pinouts and package configuration of every device you have used.

    Second, start somewhere on your schematic and highlight a single net. Find that net on the PCB and highlight that all connections are made. It is best to print out your board to as large as you can get (up to 1 meter by 2 meters). Use the same scale for ALL layers and overlay them into the correct PCB stackup, like a book. Staple them on one edge, so that you can flip through them while you mark off the traces. Now continue this until ALL nets on the schematic and ALL traces have been accounted for. Once you have completed this, you will have confidence in your PCB and can proceed to fabrication.

    Yes, it's hard and it's ugly, but it is also a necessary task. You will be well served learning to complete this task - on your own.
     
  9. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,130
    266
    With a project like this, I typically need to make PCB's 2 or 3 times to get it 100% right.

    Nobody can catch all the errors on the first try, unless it's super simple, or you are super lucky.
     
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