Itty Bitty DIY Electronic Thermometer

[D from BC]

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

 

[Robert Baer]

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

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.

 

[D from BC]

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.

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

 

[Rich Grise]

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.

Doh!...
What a crazy thought...using glue..
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