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Thread: fibercoupled 9Watt-IR-diodes ...

  1. #11
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    Is there a link to your "community project" you can share ?

    Thanks - you are an awesome source of knowledge and inspiration !

    George

  2. #12
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    ... one thread is in the German RepRap-forum - http://forums.reprap.org/read.php?336,772536

    The other in another (German too) CNC-forum with login ...

    Viktor

  3. #13
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    ... today received the first "small series" (10 sets) of the focussing heads:

    Click image for larger version. 

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    But actually in a hurry to finish the machines for the next exhibition from 14. Nov. in Munich ...

    Viktor

  4. #14
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    Quote Originally Posted by VDX View Post
    This 5x-driver a pretty "basic" and "discrete" version with predefined current steps, so decided to publish the schematics free ... have two other types with analogue and 'intelligent' controlling, which will stay "closed" for now.

    So here the schematics of the 5x LM338 driver:

    Attachment 53020

    Viktor
    Thanks for sharing your Laser Diode Driver design Viktor...

    Jerry
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  5. #15
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    Hi Jerry,

    this is the simplest design, based solely on the datasheets and a pretty old idea for combining/parallelizing of currents.

    My "comercial" driver is a bit more complex and based on current controlling with OpAmps, optimized for "spike-free" switching - but too, not so complex and overloaded with components, like other high current drivers ... and with a small Arduino for several modes of interfacing to different electronics and power controlling.

    Here is one of the prototypes, configured for the 9Watt@9Amp-IR-diode (but will work for any other type too) -- could be, I'll give it free for DIY with time too - but not so fast ...

    Click image for larger version. 

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    Viktor

  6. #16
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    ... today I've assembled a 30Watt module for experiments with laser-soldering (and maybe some SLS ):

    - first cleaved the fiber and glued it into a capillary, into a threaded tube, into a protecting hose:

    Click image for larger version. 

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    - complete assembly with fixing to/into a cooler, the 5-step-selectable (0,5A to 8,6A) constant-current driver in the background:

    Click image for larger version. 

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    - adjusting the spot distance for 200mm - there it's not a tiny dot (like 0,1mm in 30mm distance), but more like 2-3mm in diameter:

    Click image for larger version. 

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    - below threshold power @400mA:

    Click image for larger version. 

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    - above threshold @550mA:

    Click image for larger version. 

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    - @1A, emitting roughly 3,3Watts optical power (maximum for the indicator plate):

    Click image for larger version. 

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    Viktor
    Last edited by VDX; 12-13-2017 at 11:12.

  7. #17
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    Viktor:
    Looks awesome !
    I'm in the process of gathering the parts to sort of duplicate your driver -
    Will be using 3x LM338's and planning to get between 9-12 amps output.

    A few questions - why the heavy protective tube ?
    What voltage are you using as input to your driver ?

    Thanks !
    George

  8. #18
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    Hi George,

    Quote Originally Posted by gn3481 View Post
    A few questions - why the heavy protective tube ?
    ... I have them lying around (from the wrecked fiberlasers)


    What voltage are you using as input to your driver ?
    ... mostly 7 to 9 Volts - the lower, the less heating with the LM's ...

    Viktor

  9. #19
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    Victor:
    The F-BK2 cleaver is not normally used on 105um fiber -
    I think it's typically meant for 125.

    Are you finding it working fine, despite the fiber size difference ?
    Thanks !
    George

  10. #20
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    ... I've opened one - there's a resin tube as "bed" for the fiber -- should be good enough for 105µm too ...

    Viktor

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