Not especially, but in theory I suppose. I know there would be some risk, but it is just a hobby one-off thing. I'll try not to rub the polystyrene sheet over my hair before fitting it!
Thanks,
-- John Devereux
At this point I thought you knew some osbscure detail about how raccoon fur is the perfect insulator.
Should be safe from the raccoon menace around here I think.
-- John Devereux
Nice, I guess it might be a size thing that makes fibreglass itchy.
George H.
I can ship you a bunch of cat hair. We have plenty.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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Yes, of course, cotton wool. Don't know why I am trying to make it complicated.
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-- John Devereux
You should consider milling out slots to thermally isolate the LTZ1000. One idea I've seen uses kind of a swastika design.
They're getting harder to find- last batch of highest accuracy ones had to come direct from LTC with a long lead time. 8-( Not cheap either.
Yes, thanks, I know about that, do a image search and you see lots of versions.
I am trying something else, put the device on a tiny board on the end of an FFC cable so it is embedded in polystyrene and isolated from thermal gradients.
That's where I get them from anyway, not cheap as you say. Lead time not particularly bad though.
By highest accuracy I assume you mean the "A" versions with an insulated die? They may be easier to control thermally but they ought to have worse ultimate accuracy because you end up having to run the chip 10 or
20K warmer, IIRC. And the long term stability is worse with higher temperature.-- John Devereux
they are good for cleaning things, and removing adsive residue with the proper solvent. I use them with 5% distilled white vinegar to remove the dead skin around wounds.
-- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them.
I learned it from some construction workers on a jobsite as a teenager and never really cared how it work, just that it did. :) It may be that the thin film over the skin keeps you from getting microscopic cuts.
-- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them.
I use Scotchbrite for that!
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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Two thoughts: 1) As John said, *anything* solid conducts better than air. The goal is to break up the convection currents with the minimum possible mass. Cotton, fiberglass, and foam are all thermal bridges. So, since it's a one-off, how about down?
2) OTOH, if your goal is isothermal pads, some copper heatspreading may be in order too.-- Cheers, James Arthur
My supplier shifted to sheared from routed boards on a recent shipment and I ended up with a fiberglass sliver stuck under a fingernail. We call that "quality fade". Have to specify everything with those guys..
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Hmm, now we are getting back to Spheros raccoon fur again :) You'll be making me skin kittens next!
Yes, doing that too to an extent (groundplane on one side of board). Still thinking about best arrangement.
-- John Devereux
It keeps the little b*ggers warm enough in the winter, so it's probably pretty good. I'd be happy to skin one for you, but the animal rights folks get snippy about how exactly they are dispatched. The hide can be tanned by spreading their brains on the inside.
I imagine one of your bigger heat flows is going to be the ribbon cable. Flex pcbs with narrow (like 4 mil) 1/2 oz copper traces are pretty good thermally.
A copper accessory could equalize pad temps: .--------------------. | | | .''''''.-. | | / O O \ \ | | . O O . . | | | | |
The flat sides of Styrofoam sheets glue together very well with Krazy Glue (cyanoacrylate), so you can build thermal shields like Lego.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Yes that's quite cool. It's along the lines of what I am already doing with the "thermal" groundplane, but more. That 30 oz copper thing you(?) posted would make the groundplane way better.
-- John Devereux
The spray-type expanding foam and the two-part stuff may have solvents that outgas and cause problems. Styrofoam (or any type of plastic foam) may cause a static problem. You might be able to use perlite or vermiculite from the gardening center. It's very inexpensive, and a fairly good insulator.
Sure. Just 2 oz (70um) copper vs. 1mm. Oh, I should mention the "accessory" covers the pad-tops, in case that wasn't clear.
Yep, t'was me. Dunno how much they want for it, but searches showed several pcb vendors offering "heavy copper".
-- Cheers, James Arthur
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-- Cheers, James Arthur
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