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Thread: running 2x projectors from 1x dac

  1. #1
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    Default running 2x projectors from 1x dac

    i made a little box where theres 1x 25pin in and 2x 25pin out, so i can run two scanners from my fb3.

    my 10k scanner seems to display ok but my rgb does not.

    it squashes the y galvo (left and right)

    even if i unplug the second projector it makes no difference, what am i doing wrong?
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  2. #2
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    Hi Andy

    I've done the same thing to run two projectors from my PM25. So far I've not had any problems. The only thing I can surgest is double check for stray strands of wire crossing pins at the back of the DB25's in the box.

    I tryed this with a DMX board but when I tryed blanking 2 laser from the one TTL output on the board the lasers output dropped by about half surgesting that the TTL voltage was being split in half. Although I was trying to drive two analouge blanking laser at the time. The X and Y signal worked OK.

    Carl
    Last edited by Carl B; 08-14-2008 at 08:53.

  3. #3
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    Default

    Just had another thought. Is the impedence on the FB3 output OK for running two sets of scanners?

    Carl

  4. #4
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    Default

    Did you try moving the rgb to the other connector?

  5. #5
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    Default

    andy do you have both projectors wired identically ?
    you may have your single green wired for ttl and th rgb wired for analogue?

    P
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  6. #6
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    Default

    we've run three projectors at a time off a single FB3...

    no noticeable issues whatsoever. wonder what the limit is...
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  7. #7
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    Default

    Thanks for bringing this up. I wonder about this from time to time.

    Hopefully an official answer can be found for the FB3 specifically as that is what I'm running also.

  8. #8
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    Default

    I had asked a similar question through Pangolin customer support.
    The reply (paraphrasing) was that providing unusually long cable runs weren't involved, and identical wiring was utilized in both projector heads, there shouldn't be a problem. I believe very careful wiring & signal shielding considerations would probably make the big difference.

    I personally have NOT tried this yet - right now, it's just a bunch of ideas floating in my head, due in no small part to what I witnessed at SELEM
    RR

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  9. #9
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    nope still not working.

    it would seem my little 10k green works fine, but my big RGB does not like running in a pair.

    maybe its something bill did when he tunned my scanners
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  10. #10
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    a million thanks to gary for helping solve my problem.

    always make sure you connect ALL the wires!!!
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