Any pics of that QTC? Also, where do you get them?
I never considered that the battery squasher design of the E07 could be a benefit. I have to try this with mine.
There's not really much to show - it's essentially a dark grey/black 4mm square of squishy rubber material. I got a couple of spares from Don here on the forums.
So where do I send my E07 so you can make it just like yours? :bigsmile:
Or I could send you a few pills of the stuff to play with. It is cheap but there is a rather large minimum order of the stuff so I had to buy about 70 of the pills. From memory the pills are around 35 cents each and they weigh next to nothing so postage will be cheap.
While it isn't 100% efficient, it is operating more or less as a tap here, passing only so much current depending on how squished it is. When it is unsquished it has a very high resistance and as you compress it the resistance falls.
I doubt it'd work well in high power applications, the heat has to be dissipated inside a 4x4x2mm chunk of rubbery stuff.
What do you use to glue the QTC in place?
Awesome mod, Jekostas!
Don, if you have a few extra, I'd love to buy a few off of you. I've been wanting to experiment with that stuff for awhile now, but have had too many irons in the fire lately.
No problem. PM me and we'll sort it out.
The glue turned out to be a bad idea, as I ripped one piece because of the constant friction. Right now the QTC piece I have in my E07 is just being held in place by the friction of the battery. The E07 has polarity protection in the form of a small cavity in the pill where the positive post of the battery goes - it seems to work well enough.
I'll have to think up a sandwich-type holder for the tail section.
That was the problem I came across.
A couple of thin 14-14.8mm conductive discs sandwiching it would be the best bet. I've tried various coins with no success. The material is very soft.
Looking at a UK 5 pence coin, it is a little too large, but close enough I can file it and is thinner than the pill. A 4mm hole in the middle of that might work.
This is just thinking at the keyboard which I was always taught in my Computer Science classes thirty years ago was a Very Bad Thing To Do.
The 38DD had a foam centering ring.
Unless my E07 is unusual, there should be a foam spacing ring at the bottom of the battery tube that keeps the battery from touching the -ve contact when you twist the tail into the locked position. I figure one of these QTC pills would stay put a little better if you were to put it into that ring rather than at the +ve button. It also wouldn't be subject to the head's twisting action if it were glued down there.
Neither of my E07s have those foam rings in them. Would be nice if they had....
Yeah, my E07 doesn't have the foam ring either or that's the route I would've gone. As it is I use the tail lockout switch to turn the light on and off instead of the head. Doing it this way also shields the QTC pill from twisting action. It's the compression force of the battery that causes the friction problem.
That's sad news if I ever want to get another one. I'm not sure how the light would avoid battery rattle when off without it.
The foam ring was the way to go!
Mine is far from pretty, but it works. I just cut a thin piece of foam I had lying around and made a small hole in the middle to hold the QTC pill. Works brilliantly!
Thanks folks, especially frills, for the inspiration.
Told you it wasn't pretty. I put a tiny dot of epoxy on the foam to hold the pill in place. Didn't work all that well. A certain amount of care was required when inserting the foam.
Video uploading as I type.
Head or tail? Any pictures?
Tail. Pictures and YouTube bit uploading as I type. The video may take a while to be available - YouTube can be horribly slow sometimes.
See Post 28 above in a while.
Pics, pics, dozen of pics :p Very, very interesting thing, this QTC :O Thanks for the info.