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Itty Bitty DIY Electronic Thermometer

Discussion in 'Electronic Design' started by D from BC, May 25, 2007.

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  1. D from BC

    D from BC Guest

    I ordered of those linear SOT 23 temperature sensors..
    $1.40CAD... :)

    I would like to make a probe wand. (Magic wand :) )
    This would be for contact measurements.

    My plan is to put a heat pad on the SOT23 to act as a heat conducting
    cushion.
    The cushion is to provide an interface between the SOT23 and the
    surface being measured when the wand is used crooked.

    Does anybody know if a heat conducting epoxy will stick to those heat
    sink pads?


    D from BC
     
  2. Robert Baer

    Robert Baer Guest

    AFAIK the heatsink pads are silicone and not a whole lot of stuff
    will actually stick.
    I think you would be better off using the thinnest pad that will "do
    the job" for mechanical interface.
    A lot of the BERG (if i remember correctly) pads have sticky on them
    (both sides), so you do not have to "worry" about using additional
    goo/gloe/whatever.
     
  3. D from BC

    D from BC Guest

    Doh!...
    What a crazy thought...using glue.. :p
    I forgot about the heat pad with adhesive included..I'll look for
    that.
    Thanks
    D from BC
     
  4. Rich Grise

    Rich Grise Guest

    Doh!...
    What a crazy thought...using glue.. :p
    I forgot about the heat pad with adhesive included..I'll look for
    that.[/QUOTE]

    Just layout the PCB so that it's got a pointy end, and put pads out there
    that are at ground potential - arrange the circuit so that that can also
    be the device's ground, or battery power it. Let the best thermal coupling
    to the chip be to the pad that's out there flapping in the breeze. ;-)

    Then, use grease or white goo or whatever, at your leisure. :)

    Have Fun!
    Rich
     
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