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Thread: What does this mean???

  1. #1
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    Question What does this mean???

    Hi there,

    I bought a home made laserprojector with the following specs (short)

    DT40 Pro scanners
    1 watt Viasho VA-II-N-532, 532nm laser (output 1,6 watt)

    On the back of the laserprojector are 2 switches.

    can someone please tell me exactly what they mean?

    http://s749.photobucket.com/albums/x...t=IMG_0227.jpg

    I know what TTL and Analog means, but Why the + and - ?
    The OX+ and OX- doesn't ring a bell to me.

    Please help me out
    Last edited by Lassie; 07-14-2010 at 06:08. Reason: Forgot link

  2. #2
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    It most likely inverts the X galvo channel signal to mirror the image. Good if you are doing scrim versus wall projection.

  3. #3
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    im not 100%-

    but my guess would be polarity of scanning. change up to down or right to left.

    -Marc
    http://www.laserist.org/images/ildalogos/ILDA-logo_colored-beams_Corporate_150w.jpg

    ILDA- U.S. Laser Regulatory Committee

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  4. #4
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    I'd say it was positive blank or negative blank selection.
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

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    Recklessly interfering with Darwinís natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.





  5. #5
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    Thanks Doc.

    Can u explain to me what that is?

  6. #6
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    TTL lasers can be either on or off (no dimming ability). Some TTL lasers need a 5v signal to switch them on, some, some need a 5v signal to switch them off (blank). This second configuration is quite dangerous, as if the input modulation signal was to become disconnected; the laser will switch on at full power.

    I'm guessing that your projector gives you the choice to suit different TTL DACs (the DAC: Digital to Anologue Converter)is the interface box between your computer and the laser projector), though as it has an anologue option; that would be the prefered mode.

    Analogue lasers are able to adjust their brightness relative to a modulation signal of between 0v and 5v.

    Ian
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

    The Health and Safety Act 1971

    Recklessly interfering with Darwinís natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.





  7. #7
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    Thanks again doc,

    I looked inside the projector and the laserdriver is set to TTL...should i set it to ang?

  8. #8
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    Doc-

    if you look at the picture he posted, there is a dedicated switch for TTL+/TTL- and analog. The ox+ and ox- is next to that.

    my guess is still for scanning reverse.

    Lassie-

    yes, ideally you would want it set to Analog. this provides fading capabilities. TTL is either full on or full off. Analog provides a "ramping" brightness depending on the input signal

    -Marc
    http://www.laserist.org/images/ildalogos/ILDA-logo_colored-beams_Corporate_150w.jpg

    ILDA- U.S. Laser Regulatory Committee

    Authorized Dealer for:

    • Pangolin Laser Software and Hardware
    • KVANT Laser Modules & Laser Systems
    • X-Laser USA
    • CNI Lasers
    • Cambridge Technology & Eye Magic Professional Scanning Systems

    FDA/CDRH Certified Professional LuminanceRGB Laser Light Show Systems


  9. #9
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    Surely the best way of finding out, rather than us all sat here guessing, is to just plug it in and move the switch and watch what happens.

  10. #10
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    So it does could also be an option for float high, ground to blank?

    My thinking here is to do with the 'O' the international symbol for 'off' (blank)?

    ^^ +1 what Norty said ^^
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

    The Health and Safety Act 1971

    Recklessly interfering with Darwinís natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.





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