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Thread: Next build: RGBrick MK2

  1. #1
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    Laser Warning Next build: RGBrick MK2

    After the last build it was only a matter of time until the family got extended by a big brother. Actually, planning started right after the Brick and this is more than a year ago. Because the project uses quite some custom items (and was changed because of the 445nm madness... hence the name MK2) it still isn’t completely finished but its time to share some photo’s



    Just like last time the case was made using AutoCAD but now using a 30x25cm heat sink as base plate. This is only 5cm wider but the height of the case has decreased by 1cm so the other dimensions are 306x256x160mm





    On one side there are 2 tapped holes for the clamps to mount it on a truss with the heat sink pointing down. When placement on a table is required its easy to remove the 2 clamps and small rubber pads are placed to avoid scratching



    Comparing it with its little brother there isn’t changed too much. Most clear is the rotation of the heat sink and large aperture window for the DT40W’s



    On the back all Neutrik connectors are mounted inside using countersunk screws.
    Because it started to rain I quickly made the last photo so it isn’t very clear



    Some picture’s of the inside during the build.



    Ignore all the lose wires for now





    So far the following components are mounted:
    500mW green Viasho + Driver
    1W blue module
    Red driver (on top of the Viasho)
    ControlPCB v1r1 (Old version, on top of the red driver)
    DT40W’s + Drivers (Thanks Rob)
    2x PSU
    2x Neutrik XLR
    1x Neutrik Powercon
    1x ILDA pass-thru PCB

    Currently I’m building the red module that is using 3x HL6385DG placed in a custom mount that’s also used for the blue module in combination with a prism pair. The power of the red module is a far to low compared with the other modules but this was a budget decision (we’re planning to build 6 RGB projectors… yes I know we're addicted) and in the pictures above you see a large reserved space for upgrades in the future. The mounts are cooled using a TEC with Die4Chill (Thanks Robin/Dave) the NTC is placed in a hole very close to the TEC (this is what the blue wires are for)



    A special driver was designed for the blue diodes to combat the blue leak beam. Using this driver the diode glow is completely removed.
    It also contains an onboard switching power supply to increase efficiency. Using a pot the drive voltage can be adjusted to Vop of the diode (this varies a lot between each diode)
    This way the mosfet doesn't need to convert a lot of energy into heat.
    Some of you might have seen this on MasterPJ's LEM.



    For now I’m re-using the control PCB from the Bricks but a prototype of the next version (v2r0) is currently manufactured

    If everything is working the way it should it add the following features
    - Much more powerfull CPU
    - 7 differential receivers for the colours
    - Improved scanfail with higher resolution (for wide moves)
    - Electronic X, Y, XY swap
    - Isolated DMX control
    - Ethernet interface
    - Extra connections for keyswitch, remote interlock/start & buttons
    - Expansion port for connecting stuff like a display





    Movie of 2 bricks in action: http://www.photonlexicon.com/forums/...4-Wedding-show
    Last edited by SrS; 09-22-2011 at 15:14. Reason: Link to movie

  2. #2
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    Very nice, love the cases.

  3. #3
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    Wow, it's all beautiful!

    How does the blue leak work? Is the blue bias removed when scanning stops?
    This space for rent.

  4. #4
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    Great work guys,

    I like the recessed fans in the heat sink. It looks real sharp.

    Thanks for sharing.

    kit

  5. #5
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    That is a nice looking build, i am curious about the scanfail, like to hear more ;-)
    Michel

  6. #6
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    Gorgeous case!
    Surelly will become a superb projector.
    Excellent job!
    my webpage
    http://stevemilani.jimdo.com
    Skype ID: stevemilani957

    my RGB analogue projectors:
    3.9 W (640/532/445) 30kpps
    2.6 W (655/532/450) 30kpps
    2.5 W (638/532/450) 30kpps
    0.7 W (test unit)(635/532/473) 18kpps

  7. #7
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    Quote Originally Posted by dnar View Post
    Wow, it's all beautiful!

    How does the blue leak work? Is the blue bias removed when scanning stops?
    I think it looks at the intensity / blanking signal at the ilda connector.
    Most pcaom drivers work that way too.

  8. #8
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    Thanks guys...

    Quote Originally Posted by dnar View Post
    Wow, it's all beautiful!

    How does the blue leak work? Is the blue bias removed when scanning stops?
    Correct, but as you probably know most drivers arenít able to fully disable to diode glow even when you turn down the bias pot completely.
    Adding only an analog comparitor isn't going to work for some designs

    Quote Originally Posted by michelrietveld View Post
    That is a nice looking build, i am curious about the scanfail, like to hear more ;-)
    Michel
    Not much to say for now. It checks if there's movement and if not it will blank all the colour signals
    Don't expect it to be final anytime soon.

    Quote Originally Posted by -bart- View Post
    I think it looks at the intensity / blanking signal at the ilda connector.
    Most pcaom drivers work that way too.
    No, it only uses the modulation signal. But monitoring the intensity signal is a job the control board has.

    Maurice has an early version of the driver and is a bit too sensitive (turns on if he touches the mod wires or connect it to a QM) but this is an easy fix (single resistor)

  9. #9
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    Default beamshots.

    Hi guys, my projector is also finished, here are some quick beam pics from my blackberry, I will post some more in a little while.

    640nm really impressed me, I have 3x 150mw 640nm, 700mW 445nm and 600mW 532 and i'm getting a very nice white.
    Now I really know 660nm is a total waste of our time, I think this tripple 640 red will overpower any (not heavily overdriven) octo 660nm setup in brightness and pure white, and it's much easyer (safer) to audiance scan.

    Click image for larger version. 

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  10. #10
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    Very nice Maurice. You're all making me sooo jealous!

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