The best heat conductive substrate for flashlight

A couple of years ago one of our members(PilotPTK) with input from others here designed the 16mm copper sinkpad which they then produced so it’s been known of and used here extensively for some time. What I don’t understand is why sinkpad puts such narrow traces on their other boards.

Here’s what your attempt to add images looks like (/View/Source in the browser)

I did that by

1) hilighting everything across one of your responses that looked like it contains a picture I wasn’t seeing.
2) using /View/Source in the browser

so that’s the code that isn’t working for others to see — probably security problems about going out and running scripts

I got that by doing what you can do that will work to post images.
First catch your image

3) taking a screenshot of what I saw there
4) opening a free account at the free image hosting site tinypic.com
5) uploading the screenshot
6) copying out of the displayed HTML the URL for the screenshot at tinypic (without all their ancillary baggage)
7) coming to the simple post editor at BLF here
and clicking the “sunset picture” icon at top of Comment box

8) pasting the URL for the tinypic image into the first line
9) choosing 100%
10) I should have put the Tinypic site URL or something into the bottom line to add an “alt” clickable link to their site
11) clicking OK to insert the screenshot

Simple. Poke around and find a free image hosting site that you can upload images to, if there is one.
Assuming you’re behind the great firewall, we can’t really guess what sites you are permitted to see and use.

Has anyone ever tried a carbon fiber MCBPC? It’s non conductive to electricity and conducts heat like mad. It’s absolutely incredible when wrapped around a rifle barrel and the magic that it accomplishes there. Cost? I have no idea.

Carbon fiber is kind of hard to solder to, no?

Well yeah, but layers can be added to it, No? Layers that conduct, No? Technology progresses, No? At one time the earth was flat and to consider anything other was heresy, No?

As I wrote I have no idea as to the cost. But prices come down and things become doable.

As already written, carbon is an excellent conductor of heat, but it doesn’t need to be diamond. It just takes vision, yeah?

Probably not, no?

We’d still be swingin’ from trees, no?

Carbon fiber mat would conduct heat well, but in order to have a solid non flexible disk, you would have to have some sort of epoxy resin. I wouldn’t think epoxy resin would conduct heat too well. Maybe I’m wrong, no?

I didn’t pose my known use of carbon fiber as a question.

Thank you for your share,I have been re edited by Tinypic. Now can you see the pictures?

I've got it back. Can you see now?

I have been re edited,see again now?

Post #9 shows the picture now, when I look back.

The later posts still have the old script stuff behind the pictures, and that doesn’t work.

Post #10, Post #11, still can not show??

Carbon does have some of its advantages, but so far it is not suitable for thermoelectric separation PCB, LED lamp can not directly through it to heat.

PilotPTK?

Can you send a picture to see it?

The 16mm SinkPAD is round, with a black line marking 14mm and another marking 12 or 10mm, this was PilotPTK’s design that SinkPAD implemented in their original generation one format.

I like those aliang802, nice idea, the thermal pad is merely an island machined onto the original copper base, the electrical contacts cover the entire side of the board opposing this island, should be great for high current designs and surely it couldn’t be made any better than that? As I recall, MRsDNF and PilotPTK and Match and maybe even Scaru were once machining a post like that to mount an emitter on a large copper heat sink for testing and/or use in heavy duty lights.

Nice.

Where can I get some? :slight_smile:

Oh, and weren’t our spark plug wires once filled with carbon fabric? I know they were, because in the late 70’s and early 80’s I used to have to cut spark plug wires from a single cord for my Dad’s GMC lumber trucks. The silicone covering was stripped back to expose the carbon or graphite element and a metal fitting was crimped over it after folding it back across the silicone. Conducted PLENTY of electricity!

Pictures are visible now. Very good. You’ve maximized the copper +/- trace size as well as a generous central pillar. If you’re looking for possible projects you might try comparing the kinds of boards already made with copper DTP to those that are not and see of any of the vacancies find enough interest to make them worth your time to invest in. One that comes to mind is the oval twin led mcpcb for bike lights, as far as I know none of those are either copper or DTP. A copper quad DTP for the ledil cute-4 optic is another.

I think you were getting some push back aliang802 because your OP sounded like you were trying to teach us about a basic concept that some folks here helped pioneer. We widely use DTP bases such as Noctigon, SinkPAD, Manker, our own customer creations, etc.

Looking at your bases, they look real good. Usually the thermal pad is a bit lower than the electrical pads in the DTP bases we use. Looks like you will make the thermal pad completely flush (level) with the electrical pads and also extend it out to the sides for an even greater thermal path. I think folks here will be very interested in your bases if the prices are reasonable.

Yes, less solder the better, for thermal transfer, no? :smiley: :+1: