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Thread: DAC building Question

  1. #1
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    Default DAC building Question

    So I want to build this DAC


    but I only see one TTL output. I'd like to use Popelscan. How can I get at least 2. Is there any better free software other than Popelscan? Dac I can build on a budget?

    Cheers!

  2. #2

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    Hi DjDevNull,

    I have played with Popelscan.
    It appears to only have blanking on the parallel port - there are no separate RGB signals on there - hence only one TTL output.

    Popelscan looks like it supports RGB with the Easy Lase USB DAC.

    Regards,
    Robin

  3. #3
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    Default

    Oh! Sorry somebody answered my question Here it Is!




    Now only if my galvos will come back from china

  4. #4

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    Popelscan does not support the Easylase DAC even if there are options for it. He that made popelscan never got it working and doesn't develop it any more.

    However if there are any delphi programmers here the source is free to use.
    You know, I have one simple request. And that is to have sharks with frickin' laser beams attached to their heads!

  5. #5

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    Hi Guys,

    Thanks for the info.
    I did not know that the Easy Lase option was NOP in Popelscan.

    I got Popelscan running with my DAC design - I have a CPLD to translate any parallel format to drive my DACs.
    When I scoped the parallel port I could only find write pulses for X & Y + composite blanking.
    Blanking was on /C0 (pin 1), Xwrite was on /C1 (pin 14) and Ywrite was on C2 (pin 16). There was no activity on /C3 (pin 17).
    Did I miss something in the software setup or was this RGB DAC added at a later date?

    Regards,
    Robin.

  6. #6
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    Default

    Yeah! you have to set on the "Switch-PCB" option then pin 17 comes alive

  7. #7

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    Thanks!!!

    ( I am embarrassed to have fallen victim to the 'does not work in off mode' though )

    Regards,
    Robin

  8. #8
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    Default

    Oh! and here is how to get the 8 beam switches to work




    Has anybody got this to work with mamba?

    Cheers!

  9. #9

    Default

    Again, thanks for the info.

    You will not be able to get that DAC working with the Mamba built in Parallel driver. It will not let you combine RGB and blanking into one byte. You have to send red with one write then green, then blue...
    However Mamba will let you write your own drivers.
    They are basically DLLs that have been renamed to .mld
    I have hacked a version of impout32.dll from www.logix4u.net
    They have a DLL & kernel mode driver to give access to the parallel port on win2K and XP. I made this accept the Mamba calls. It would be a simple task to mod this to drive the DAC below. If you can do it I will give you the source (Visual C++ 6.0 project) or give me a week or so & I will see what I can do.

    Regards,
    Robin.

  10. #10

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    Hi there,

    I am using popelscan and the DAC posted at the start of this thread. I want to be able to blank 2 seprate lasers... How can this be done? Is it as simple as adding that SN74hc574 chip?


    Cheers
    John
    [/url]

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