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Rigid flex pcbs?

Discussion in 'Electronic Design' started by steve, Nov 5, 2004.

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  1. steve

    steve Guest

    I have a need to fit a printed circuit board into a small cabinet, I
    basically need two sides of the board to bend at 90 degrees
    (connectors are an option with seperate PCB's, but the fit is very
    tight). I was thinking about rigid flex pcbs. Any experience with
    them? Whats the minimum size of the flexible portion, for instance?
    What are the general concerns with these hybrid boards?
    Price shouldn't be a concern since the boards are very small and the
    parts on them are very high price. thanks!
     
  2. Jamie Morken

    Jamie Morken Guest

    Hi Steve,
    Try soldering the boards together using pads on each board like this:
    http://eagleflyer.sourceforge.net/accel_gyro 1/IMAGE003.JPG

    cheers
    Jamie Morken
     
  3. steve

    steve Guest

    Great idea, I guess I was thinking too much! Are there different
    connections on each side of the board, or are both sides soldered to
    the same trace (in other words are there seperate pads on each side
    with different signals or is there one big pad on the motherboard that
    gets soldered to both sides of the daughter board?)

    Is that board some type of navigation control for a model rocket? I
    fly radio control planes, I couldn't find anything on the site that
    talks about it.
     
  4. N. Thornton

    N. Thornton Guest

    why not use wire links? Just a row of very short wire conenctions.

    One plus is you can wave solder the whole lot in one piece then snap
    it along the perfs. Though if density needs to be extreme you might
    not want to waste the millimetres for a snapped bit.

    NT
     
  5. Jamie Morken

    Jamie Morken Guest

    Hi Steve,
    There is one big pad on the the motherboard for each solder connection,
    but you could put different connections on both sides too, I only needed
    6 signals though.
    It is a homebuilt inertial measurement unit using the Analog Devices
    adxrs gyros and adxl accelerometers and a 16bit ADC, and an atmega32
    with 4MB of datalogging flash.

    cheers,
    Jamie
     
  6. budgie

    budgie Guest

    (snip)

    and (as someone posted in this group a year or so back,) that approach lends
    itself to product testing before snapping. Very handy.
     
  7. steve

    steve Guest

    Jamie,

    Very nice homebuilt, I am wondering how did you solder the BGA device?
    Oven? Or an pcb assembly shop?

    steve
     
  8. Jamie Morken

    Jamie Morken Guest

    Hi Steve,
    Thanks! It was my first time working with BGA, I used a toaster oven
    (works better than great!)

    cheers,
    Jamie
     
  9. steve

    steve Guest

  10. Jamie Morken

    Jamie Morken Guest

    Hi Steve,
    I used a stencil for all but one board I had, and it was a lot more
    trouble not having a stencil. It can be done either way though..

    cheers,
    Jamie
     
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