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Thread: 6x 405nm diode testing

  1. #11
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    I'm sure you could push it to 300mw stable with a TEC cooler.

  2. #12
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    i might try 250mw later in the week when i get time
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  3. #13
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    What's the dimensions of the ally block the diode is fitted in ?
    How big is the hole ? And how big is the ring around the diode housing ?
    Is it threaded ?

    I ask this because i am into the same kind of experiments and would like to know.
    I have ally blocks, but when i see these pics they might be too big (or to be used with 2 diodes ;-))))

    The insulation was needed because the diodes are case positive right ?
    So when the outside touches the earth there runs full power through the diodes ?

  4. #14
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    Quote Originally Posted by hobbybob View Post
    What's the dimensions of the ally block the diode is fitted in ?
    How big is the hole ? And how big is the ring around the diode housing ?
    Is it threaded ?

    I ask this because i am into the same kind of experiments and would like to know.
    I have ally blocks, but when i see these pics they might be too big (or to be used with 2 diodes ;-))))

    The insulation was needed because the diodes are case positive right ?
    So when the outside touches the earth there runs full power through the diodes ?
    alum block - 20mm x 20mm x 10mm

    hole 14mm

    12mm aixiz housing/case

    not threaded.

    indeed the diode is case positive, but the thremal heat sink compound solves this problem
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  5. #15
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    And the trick to mount the diode housing with the thermal compound ?
    What jig do you use to keep it in place ?
    Will you first mount the diode housing and THEN put in a diode , or do you fit housing and when thermal compound hardens you mount the diode ?
    And what type of thermal compound ? does it harden ? And still conduct ?
    If i see correctly Is there a hole in the top , where you put in the compound ?

  6. #16
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    ops let me fine some details
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  7. #17
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    this method was developed by simon, i have just adapted it to suit my needs. i know simon and dave both have access to a mill etc...

    i dont, so had to come up with my own way. both simon and dave do it slightly different to me.

    first a few important tools -

    thermal bonding kit -
    http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=1558320

    syringe - i cut mine in half, the reason for this
    1 - so i can mix the thermal paste directly inside
    2 - so i can clean the syrine and reuse it




    a block of aluminium 10mm thick

    im using an aixiz case which is 12mm wide. i drilled a 14mm hole with a hole in the top of the block to inject the paste



    next due to a lack of a mill i had my own custom sleeve made. it has a small lip on it so that it holds the aixiz case centered in the 14mm hole. it also seals one end of the 14mm hole, to stop the paste coming out and forcing it around the aixiz case.













    i then clamp it all down and start injecting the paste







    the pics above were from the very first time i did this and it was a little messy. i have since revised my methdos slightly which produces a much much better finish and alot less mess.

    all i did was get new slightly different sleeves made







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  8. #18
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    Hi, why having an extra sleeve and a 14mm hole? I just put the Aixiz tube into a 12mm dia hole in an alu block, with some thermal compound around and pressed on firmly by a screw. The thermal contact is good enough, the temperature difference between Aixiz tube and the outer block is minimal (I checked but forgot the precise data).

  9. #19
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    cos the idea of the above is to insulate the diode.

    putting a 12mm aixiz casing into a 12mm hole wont work for more than one diode
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  10. #20
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    Andy, perhapse you should reprhase that.

    The material is there to 'isolate' the two diodes and drivers electrically.
    Aswell as provide thermal conduction.
    Chad.


    When the going gets weird, the weird turn pro.


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