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Thread: can my DAC handle 30k pps ?

  1. #1
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    Default can my DAC handle 30k pps ?

    I got this DAC that i did buy from mylaserpage.de !
    It`s a cheap and easy to use DAC, and it works perfect with my M6008 galvo.
    And as some know I gonna update the system with better galvo.
    Maybe someone that can run a ilda test pattern in 30k pps ?

    But i wonder if my DAC is OK to use ?
    Do I need any better\faster DAC or can I just use the one i got ?

    Remember that it`s only for home entertainment

  2. #2
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    I forgot to say:

    It`s a 8-bit DAC
    and here is some SPEC from the page:
    Professionell hergestellte Platine, doppelseitig, durchkontaktiert.
    Beidseitig Bestückt.

    Ausgänge:

    2 x 8 Bit analoge Ausgänge für X und Y
    Amplitude und Offset einstellbar bis max +/- 10V

    TTL- Ausgänge für Blanking, Red, Green, Blue.
    Damit auch Mischfarben möglich
    (Gelb, Cyan, Weiss )

    8 TTL - Ausgänge für Strahlschalter

    Alle TTL´s sind mit max 20mA belastbar und nicht kurzschlussfest.
    Popelscan steuert diesen Wandler mit bis zu 20.000 Punkten pro Sec. an.
    Somit auch zum Aufstieg mit anderen Scannern geeignet.
    (z.b. M6008, M9024, G120, LC1, LC2, CTxxxx ...)

    I dont read germany so well, but it says 20k pps maybe ?

  3. #3

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    My rough german translates that as:

    With/using popelscan, one can expect 20k.

    I believe the emphasis is that the popelscan software is the "weak link" in the chain.

    The actual hardware should be able to do it, i dont see why not. The software though, thats where it gets difficult. heh.

  4. #4
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    Hi there,

    good translation :-) Yep, the software it seems to be, but I remember the next bottleneck is the parallel port (some other thread points it out; forgotten, which one - ah, here, in one of the posts).

    Btw: One of the guys from the linuxlaser.org site just finnished the translation of the popelscan source to C++, as I could see last week with my own eyes :-) And that alone seems to speed up things a little bit, as well as optimizing some of the routines. However, you have to be using Linux for the next version...

    Cheers
    Christoph
    Popelscan is still alive - check out here!

  5. #5
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    Oh nice...

    I like popelscan, but there are some stuff in there that i dont like !
    Some error messages somethimes :roll:

    Btw, when you are here;
    How do you do it when you make a show in popelscan with mp3 (maybe 4 min song)
    When I hit the PLAY button, and click on the MOT files to "add" into the showlist, it is OK...
    But if I stop 2 min after adding MOT files, and (save) then start again and try to add more MOT files, there is sometimes not working .... ?!

    Hard to explain, but to say it short: I have to make one show with one MP3 song LIVE and complete the entire song... :lol: :lol:


    BTW, I dont have Linux :x :x :x

  6. #6
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    Edit: Seems to be a tad off topic, but hey....

    To prevent problems, simply don't use Popelscan to create shows.

    A simple yet sufficient tool one can use is Showtime LE, available here:
    http://laser.cco-ev.de/popelscan/Showtime%20LE/

    Basically, all you gotta do is
    1. download
    2. install
    3. run the exe
    4. Load mp3 using the "Datei->mp3 laden" menu. Works best with constant bit rate mp3s.
    5. create a trace (waveform) using menu "Neuer Trace"
    6. "ready for tracing - press start to trace". Mind it either samples from the mic or from the internal Stereo mix. You might try different volumes. Since it samples in real time, don't disturb the program too much.
    7. after finnishing save the trace ("Speichern"), best into the same folder as the mp3
    8. close window ("Schließen")
    9. Play sound by clicking the "Play" button or pressing the right mouse button at the desired position in the waveform window
    10. Set markers where the mot files shoud play during playback:
    i. while "PLAY"ing, press the space bar OR click on "Frame setzten" to place a marker
    ii. set the cursor (red line) to the desired position in the window without playing the song and press the space bar OR click on "Frame setzten" to place a marker
    11. adjust marker using your mouse so it is synchronous to the music (use the right mous button to test if you got to the right position)
    12. add MOTs to the marker:
    drag and drop an existing mot file from the selection below into the trace window and drop it very closely to the name of the marker (i.g. "Nicht belegt" = not set). The mouse cursor should change. You might have to switch the folder to get access to mot files.
    13. save the mtm track using the menu "mtm speichern"
    16. Make sure that from this point:
    i. all the referenced mot files, mp3 file and mtm file are located in the same folder.
    ii. all the markers have been set with mot files. To prevent popelscan vom sending annoying messages simply create a mot file named "Nicht belegt" (no extension!) and drop it into the same folder. You may want to check the mtm file with a simple text editor for left over "Nicht belegt" markers or use the Showtime function "Nicht belegte Marker <n>: Anzeigen" button.
    14. load mtm into Popelscan using the "Load Motlist" button.
    15. Load the mp3 file
    16. Play back and enjoy :-)


    I hope it's enough for the beginning. If one needs more information, check out the (german) html help or post your questions here.

    Cheers
    Christoph
    P.S. Nope, it's NOT my program, i didn't develop it ;-)
    Popelscan is still alive - check out here!

  7. #7
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    wow that is great !!!!

    I have not yet tryed it...
    But I will for sure !!

    It seems great, now I dont have to try 3-5 times 5 min everytime to make a show


    I will let u know how it goes
    Thanx again

  8. #8
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    The showtime was great to use

    Only 2 bad that you cant se the mot files (in action) when you making the show..

    I always forgot how effect on the file is....
    But the showtime is great for editing\syncing the existing files i got


    super !!

  9. #9
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    Quote Originally Posted by liteglow
    I always forgot how effect on the file is....
    Open Showtime and Popelscan side-by-side ;-)

    It's not really without pain, but much better than without...

    Cheers
    Christoph
    Popelscan is still alive - check out here!

  10. #10
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    Quote Originally Posted by chw9999
    Quote Originally Posted by liteglow
    I always forgot how effect on the file is....
    Open Showtime and Popelscan side-by-side ;-)

    It's not really without pain, but much better than without...

    Cheers
    Christoph
    Yes that was in mi mind to do
    When I got time I will try to make a nice show using showtime

    Thanx for the help...

    Cheers
    Filip

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