WTB 1-2 QTC squares

OK, I found that supplier:

5-pack of 10x10x1 mm pills is $4.58 but shipping is $7.68. Not much more than a 2-pack (of unspecified size) from veleno.

I found also
http://zoflex.com/products.html
They sell sheets.
Small sheet 152x152x1 mm is $35 + $11.5 shipping.
They have also larger sheets (304x304), 3 different thicknesses (0.5, 1, 1.5 mm), 2 hardness choices.

The Valeno designs pill will most likely be 4mm x 4mm.

That’s a really good deal for the mindsets 10mm pills if the material has the same or better properties to the usual QTC stuff.

I gotta ask… what exactly do you use this stuff for?

If I remember correctly, you can make an infinitely variable output flashlight with it, but sadly, QTC isn't very durable.

BLF member Match used QTC years ago in one of his threads.

There are a few light makers that produce QTC flashlights:

  • Veleno
  • Peak
  • Fraz
  • I’ve seen a rumour that Acebeam 10160 uses QTC to

Myself I love QTC, it’s extremely simple and works great. I like this from-firefly-to-turbo adjustment better than any non-e-switch UI. And e-switches come with a few issues of their own, especially if one wants a really small light.

Thanks guys. Cool stuff indeed. It’s the first time I’ve seen/heard of it. I can certainly see the appeal of it, at least for lights using batteries that don’t have over-discharge issues.

I was interested so a little more googling shows that “Velostat pressure sensitive conductive sheet” is available from many places such as Tinkersphere $3.99 for 12” x 12” piece. Same stuff available directly from Adafruit, Digikey or Amazon for slightly more. Same properties as QTC???

As I remember from Match the only hitch in using this was getting it to stay at one setting. Need some kind of detent to hold the pressure steady.

Great, now you’ve got me wondering what I can do with Indium Tin Oxide Coated PET Plastic :person_facepalming: :smiley:

It’s only 0.1 mm thick…

Isn’t this possible to make yourself?
I mean like a piece of plastic sponge, soaked with graphite and latex mixture or something?
(i guess i should try that myself ?)

It is difficult enough to get the factory stuff working properly.

So, i guess that’s a no then… :person_facepalming:

Not at all, you might make something revolutionary, but, more likely, just get a sore head trying :smiley:

I’ve played around with QTC a fair bit and never got it performing 100% to my liking but it can be useful for smaller builds. I might have another go.

Yeah I cant see how the velostat sheet would work for us being so thin, not compressible?
Didn’t look into it.

I tried some QTC and then gave it away because afaict it only works in single mode lights that are battery crushers (no spring above or below the battery).

I do not own any battery crusher lights…
All my lights have a spring, so the QTC would not work.

Graphite powder would seem like the suitable conducting material though.
I’ll pick up a flask at the hard wear store, see what i can do with it.

Good point.
I would like to try it in my Astrolux M01. (10180 keychain light)
No springs and the minus goes via the threads.

I’ve tried qtc before. I prefer the reliability and feel of infinitely variable control rings but those lights are bigger than qtc lights. I would like to try making a non-battery crush qtc host one day, just for the challenge of it :student:

I did that with a cooyoo 10180 light.
Separate battery compartment, the head twisted to compress the QTC pill onto a fixed stationary contact not the cell itself.

And did it work?
(i think all those keychain USB charged 10180 lights are the same inside)

I wouldn’t have mentioned it otherwise :smiley:

Yeah, I mean the light was stripped & heavily modified, just remembered it with pinks comment.
A slightly better way to implement QTC.
So you could have a sprung cell compartment and just the head or tail unit doing the variable thing without crushing the cell.

Found an old pic.