Playing with QTCs / Fun with QTC / Merged

[RCantor]

Oh, I knew I had a serious question...

With the QTC in a single mode light - when you run it on low does the runtime increase or does the extra power turn to heat or both? If both any idea what % goes to heat vs what % is increased runtime? Thanks.

 

[houtex]

Re: Fun with QTC

Disclaimer: I'm really dumb when it comes to these kinds of workings.

That said,would this work with an Oveready ZeroRez tailcap? I think that would be the coolest.

 

[PCC]

Re: Fun with QTC

That said,would this work with an Oveready ZeroRez tailcap? I think that would be the coolest.

No, it can't easily be incorporated in a ZeroRez.

 

[archimedes]

Oh, I knew I had a serious question...
With the QTC in a single mode light - when you run it on low does the runtime increase or does the extra power turn to heat or both? If both any idea what % goes to heat vs what % is increased runtime? Thanks.

Run-times are very long with QTC set to low output. There is a thread posted in the Peak sub-forum documenting a single CR123 primary cell lasting for over 376 hours in a Logan QTC model.

 

[RCantor]

Wow! Thanks for the reply.

 

[shao.fu.tzer]

The only drifting I experienced is when trying to get ultra low, you have to sneak up on it.
I guess you don't like it?

Same here... getting a really low low without drifting is tough... It seems to work beautifully in the mid-high range though...

You working on this Shao? Sounds like it would eliminate some of the perceived problems . . .

Yes, along with a few other QTC projects. I've been spending so much time trying to implement this into a clicky, that I haven't had time to list new inventory! I'm determined to master this material! It's interesting - I just checked the Peak thread and saw that they came up with something similar to one of my early QTC pill twisty protectors - a ring of foam cut to the height of the QTC pill with a metal disc glued to the rim of the foam. It protected the pill nicely, but the torque eventually ate up the foam. So now I'm experimenting with springs. I'll keep everyone posted.

 

[flashmenow]

Hi all on the market place I purchased a 12W RED LED to use as a future mod into a light.

Today I was playing around to power it up (crudely) Using a CR123 and placing the QTC square on top of the positive terminal and applying pressure to activate.

When I build this light I am going to facilitate the QTC into a pressure switch to use as well as having a on/off clicky.

Enjoy the new video. Glenn

 

[edc3]

Anyone tried this material in a Fenix E05 yet? I've got some QTC on the way and I'm thinking whether I want to spend money on batteries for my EZ CR2 or put that towards an E05 that I can run on Eneloops. A continuously variable floody keychain light for $20 is very appealing to me.

 

[Zendude]

Well, I had a little bit of success with the E01. I cut down a spring from another host and formed it as best I could around a AAA battery. I then placed the spring in the body where the negative terminal on the head mates . I removed the tail spring from the E01 and replaced it with thin washers until the positive terminal was just above the negative contact. I was able to vary the brightness but I still had contact issues.

I had some success with my Ti Quark AA as well. I placed a cut down screw inside the tailcap spring to make it bottom out prematurely, programmed the light for loose/turbo and placed QTC on the positive terminal. I was able to vary brightness while retaining clicky functionality(because it's Ti, you could also keep the head tight and vary the brightness by loosening/tightening the tailcap). It still needs some refining though, because the spring caused inconsistent ramping. I also center punched a penny(to give it a cone shape) and placed it between the tailcap and body. Ramping worked nicely but you loose the clicky.

My hope is this will spark some ideas in a more competent modder.:candle:

 

[PCC]

Re: Playing with QTCs

So, I finally got off my lazy behind and finished a QTC mod that I had started months ago. It's a simple aluminum ring that I cut on the lathe that fits between the end of the body of a SureFire 6P and the tail cap. The Z41 tail cap has been converted to a McClicky and the drop-in is the ThruNite low voltage 1.5A three-mode XM-L. The ring has a strip of stick-on foam that is used to prevent the twisting action from torquing on the QTC so that it may prolong the life of it and to help hold it in place as well as to help smooth out the transition as it ramps up or down. The foam itself started off thicker than the QTC, but, has been compressed to the same approximate thickness from being installed in the flashlight. On to the pictures:

QTC ring sitting on the bored 6P ready for me to install the tail cap.

Another shot so that you can see how it fits together. Can you find the QTC in this or the above picture?

Here's an interesting shot. The right light is a Quark 123T on moonlight mode (0.2 lumens), the middle light a Ra Clicky 120 on the lowest low (0.08 lumens), and the left is the 6P on low with the die of the LED barely emitting any light because the QTC is only allowing a trickle of current to the LED.

The only thing about having the light putting out this little light is that it will ramp up on its own slowly over time and the light will be about as bright as the Quark after about a minute or so.

 

[Helmut.G]

Re: Playing with QTCs

thank you for posting this, PCC :twothumbs

 

[eyeeatingfish]

Re: Playing with QTCs

So where can we buy the QTC material? I found a website in England but shipping is of course a lot to America and there is a minimum order but the QTC pills are relatively inexpensive. You would have to order a lot.

 

[emu124]

:wave:

Try it here:

http://www.cpfmarketplace.com/mp/showthread.php?253272-F-S-QTC

 

[smarkum]

I've got PLENTY left if anyone still wants more . . .

 

[kramer5150]

Does QTC work with Incans?

I have a SF-G2 thats been modded with a rev-clicky and larger 2x O-rings at the tailcap. So even with the tailcap unscrewed its really tight, firm and seals out water from moderate splashes.

thanks!!

 

[MosesM]

kramer: QTCs should work with incans as well since it only affects resistance.

 

[Helmut.G]

In principle they work nicely with incans, but it can be hard to get a light to work with QTCs that wasn't designed for it.

 

[Linger]

re: Incans - there's a chance QTC will be the ideal soft-start medium, slowly ramp-up the energy until the filament lights, gradually tighten towards to overdrive as desired, but little of the associated resister losses of other methods.

 

[smarkum]

I've got 20 packets of QTC left for those interested . . .

 

[jasonck08]

I'm wondering if some type of electrically conductive epoxy could be used to secure the QTC's in place. Anyone try that?