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Thread: Using Analogue mod lasers on TTL

  1. #1
    Join Date
    Mar 2008
    Location
    Preston, Lancashire UK
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    1,064

    Default Using Analogue mod lasers on TTL

    Hi People

    Can anyone tell me if Analogue modulated lasers work ok with TTL as I have 2 new CNI 150mW lasers with Analogue modulation but no controller with Analogue Mod until my PM25 arrives.

    I have tryed the lasers with my TTL blanking DMX system and they did'nt seem to happy. When I set the TTL signal high the laser output was not full power but seemed to get brighter after a few minuets. The Image blanking seemed to be ok but if I blacked out the image for more than about 20 seconds then the output power takes time to come back to full power.

    I intend to run two projectors from the one output from my controller meaning both lasers using the same blanking signal. When I tryed this with the TTL signal from my DMX system, the output power of the two lasers dropped by about half sergesting the 5v's is being devided between the two lasers.
    Will this be the issue with an Analogue signal. BTW my old TTL lasers were happy working together on one TTL singnal.

    Any and all help will be greatfully recived.

    Carl

  2. #2
    Join Date
    Jan 2007
    Location
    Sheepsville, Wales, UK
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    Default

    Carl

    Some lasers have a separate input for TTL to the analogue one but with CNI Im pretty certain this is not the case and this should be no different to an analogue signal switching between 0 and 5v without any intermediate points so should work.
    You certainly shouldnt have any problem spliting the signal between 2 lasers as the inputs should be of high enough impedance not to affect the signal. Maybe try putting something like a 10k resistor in series with the input of each laser to be sure - the value is not important (within reason) as there will be little current flow to the input.
    Failing this maybe you need to make up a circuit to interface/buffer between the output of the projector and the laser though you really shouldnt have to.

    Rob
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  3. #3
    Join Date
    Mar 2008
    Location
    Preston, Lancashire UK
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    Default

    Hi Rob

    Thanks for your thoughts on this. I think i'll wait till the PM25 arrives with proper analogue moding and see how the lasers react befor trying anything els.

    This waiting for my controller is doing my head in a bit but I don't want to keep pestering George as he is still quite buisy with work but i'm hoping it will arrive sometime this week. When I last spoke to him the missing metal work that needed replacing was ready and the desk just needed programming. Heres living in hope.

    Carl

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