Wednesday, January 14, 2015

drawing traces..

A small update.. I've been steadily drawing traces. It's going to be a 4 layer PCB, most of it based on the LaCie design. I desoldered all components from the LaCie PCB and made some high resolution photo's as a reference. Together with my multimeter I've been following the traces, here is where I'm currently at:


Look at the size of P1, that's a regular jumper used for disc ejection, just to give you an idea of the dimensions we're dealing with. Although I know where I'm heading to, it's more work than I expected. It probably also has to do with the fact that this will be my first multi-layered PCB. I'm learning so much while moving forward, I love that. Luckily I know a couple of electrical engineers who will be able to check my work. Anyway I'm not going to rush it, it needs to be done well!
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4 comments:

  1. SchmikeJanuary 16, 2015 at 7:40 PM

    Hi, Mr. Wicked
    Can it using on USB 2.0 FULL SPEED MODE?
    I want to use USB Isolator which haven't High speed mode

    Will you add the commode choke at the PCB usb trace?
    It can help to get better performance of the USB signal
    Thanks

    ReplyDelete
    Replies
    1. Mr WickedJanuary 27, 2015 at 10:36 PM

      Cheers Schmike:

      It operates at high speed and full speed, the NEC reference has no common mode choke in its design. The documentation explicitly mentions: "EMI filter such as common mode choke may degrade USB signaling waveform. Design properly when it is used."

      I will see how my prototype performs and go from there.

      Delete
    2. SchmikeJanuary 28, 2015 at 8:46 PM

      That great
      If it can use the usb isolator is best

      Delete
  2. UnknownJanuary 17, 2015 at 4:49 AM

    Good stuff, mate.

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