I store my paste at room temperature. I like to live dangerously! (I
also don't have room in my house for another refrigerator, regardless of
size...)
That said, I recently bought some fresh paste...although my old stuff
(and I mean old...several years of room-temp storage) still reflows, I
was amazed by how many fewer bridge problems cropped up with the fresh
stuff. My workflow had been stencil, place, reflow, clean up several
bridges on all four sides of TQFPs...with fresh paste, there was almost
no cleanup to be done.
I still store at room temp, though. XD
As an aside, I've been thinking about switching to a low-temp
tin-bismuth alloy, but I hear even the tiniest bit of lead will really
attack and weaken that stuff, and I can't guarantee there aren't some
atoms of lead still clinging to my iron..
-B
On 2/2/21 5:14 PM, Pete Soper via TriEmbed wrote:
Thanks, guys. The connections were red for positive, blue for ground and
brown for what I assume is the PWM input. It spins up with 5V just fine
and I feel silly about the high resistance measurement. The fan cools a
pair of heat pipes from two IC sites side by side and the whole thing is
copper. The IC sites have faint markings but I can just make out "attach
Peltier devices here". After only eight years I may be able to store my
solder paste in something smaller than a dorm fridge. :-)
-Pete
On 2/2/21 2:34 PM, Brian via TriEmbed wrote:
On 2/2/21 1:15 PM, Pete Soper via TriEmbed wrote:
The DC resistance between any two pins with any polarity is much
higher than I would have expected: thousands of ohms.
Others have already mentioned:
- It's probably a brushless motor
- Three wires are probably power, ground, and tachometer
The reason you see an unexpectedly high resistance across the power
leads is because there are active electronics inside the thing to
commutate the brushless motor. You're not measuring a motor winding.
I say if you have a red and black wire, hook that up to +5 VDC and see
if she spins.
-B
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