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Thread: +/- 24volts for galvos

  1. #11
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    Quote Originally Posted by taggalucci View Post
    Hmm, + and - rails from a single PSU? Not without an isolated DC/DC convertor (which is like another PSU anyway).

    ...unless any more electron-cogniscent folks can enlighten us.
    That's one way to do it.

    Another way is a non-insulated voltage inverter.

    ...Or a 48V single supply with a rail-splitter.

    Both are quite small, but price will most likely be the same as two PSUs anyway.

    /Thomas

  2. #12
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    Quote Originally Posted by hakzaw1 View Post
    Thanks for all the posts and my apoligy to the OP- not meaning to threadjack you.
    But while you had all these great 'helpers' I wanted to learn more and thereby waste less time and money.
    no problem Lem, i also learned from your questions and subsequent answers. that's the whole point!
    "its called character briggs..."

  3. #13
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    ha ha you called me--LEM-- I love laser enthuaists meets(LEMs) and considered changing my user name to LaserLemLen ( which would be a little redundant)--lol

    len

  4. #14
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    Quote Originally Posted by hakzaw1 View Post
    ha ha you called me--LEM-- I love laser enthuaists meets(LEMs) and considered changing my user name to LaserLemLen ( which would be a little redundant)--lol

    len

    ha ha ha!!! my apologies! this is my second name-screwup in here. the first one was some time ago, when i called dsli_jon as "john"... i was lucky enough he didn't send an ultra powerfull laserbeam my way
    "its called character briggs..."

  5. #15
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    Click image for larger version. 

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ID:	27528N?P my friend

    I still dont know if my lambda PS will take care of everything- hope so- I am running out of space.
    my working area is 22X 12 &5/16th inches and none too deep - but no worries about warping os the HS abilities- it is heavy finned and weighs 13 lbs for just the base. end pieces also 1 inch thick counting the fins.

    Has a place for two fans on the bottom and 120+ drilled and tapped holes left from the rgb that once lived in it(thanks Mike for the sweet deal @40$)
    the opening is 20 MM up from the base and off to one side ( right if facing) I hope to build this with an access door to get to the mounts w/o having to remove the top.

    red closest to scanner green in the middle and 445 farthest.
    hope i can get 1.5 to 1.8W from it.

    lots of help so far thanks to all- too many to mention atm.


    cheerz len
    Last edited by hakzaw1; 09-21-2011 at 21:12.

  6. #16
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    Default dual rail from single rail (half the voltage though)

    i was browsing for some other stuff when i ran into this

    http://www.datasheetcatalog.org/data...onics/1317.pdf

    check out figure 13. To make a long story short, this chip takes 8 to 36 volts single rail and makes it 4 to 18 volts "symmetrical" (dual) rail

    maybe it proves usefull to somebody, as it handles up to 3amps
    "its called character briggs..."

  7. #17
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    That is what they call a railsplitter

    Personally I would not use such a device, because current spikes (not uncommon for galvo amps) on the positive rail, might end up as voltage spikes on the negative rail.
    And when one rail is shorted, it will wreak havoc on the opposite rail.

  8. #18
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    And you have to find a +36V power supply which is quite uncommon...

    I found this one too which seems nice, a simple +-24V rectifier, HB-Laser are using them for their EyeMagic scanners : http://shop.hb-laser.com/OEM/elektro...ply::3182.html

  9. #19
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    i don't get it, why do they use two bridge rectifiers?

    i think just one will do the trick

    something like this simple design (not this one of course, it can't handle high amps)

    "its called character briggs..."

  10. #20
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    Yes it's strange, I usually saw only one rectifier. Maybe to have completely independant rails, but I don't see the advantage...

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