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Old 09-22-2007, 07:31 PM #1
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Default It just won't burn!!!!!! SenKat GB in a torch

Hi,

I FINALLY got my parts from the US and spent the afternoon putting them in a 2x AAA mini mag copy - as good as though.

My "circuit" is a 16V 47uF Electrolytic Capacitor piggybacked onto the LD, and a current resistor (10 ohm) from the 2x 1.5V AAA batteries. Very neatly packed into the torch. I measured twice and cut once'd on everything - so not to blow my presicous LD.

I get about 240mA on fresh bats, and about 160mA on an old set. It's bloddy bright - I think I might be investing in some goggles very quickly, as I like my eyes as they are.

It just won't pop/burn/etch/light/melt ANYTHING!
I even went to our local balloon shop and bought a bag of black balloons to try - nothing! I left it there for about 60 seconds, and it won't burst. It just sits there being balloonish.

I did get a tiny puff of smoke from a match - but alas, it did not light.

I must be underpowering this LD, but I've followed the reccomended specs for basically everything - bar the torch itself - but that's just a fancy case.

Being in the UK, I don't really want a $17 LED, and the fact of ordering more taking about 4 weeks. The last GB one took the best part of 3 weeks.

Also, for this kind of work - DVD drive lasers etc. - what are the best goggles - I know there is a search button, and I have looked, but I get confused with all the , 3-5 transparency etc. Could someone definitvly say what I should be looking for, where I can buy them from the UK, or US, and if from the US, could I paysome for them and they send them to me via themselves if the company doesn't post out to the UK!


Lastly, what kind of duty cycle is best? I've heard 60/60 works well. Can anyone advise better?
Nothing gets hot in the case.....

Ta!


Dan :-)


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Old 09-22-2007, 07:38 PM #2
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Something is wrong with your measurements. With a 2.2 ohm resistor and a pair of alkaline batteries you would be feeding the diode appx. 160ma's. The 10 ohm resistor is the problem if I am reading your post correctly..
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Old 09-22-2007, 07:38 PM #3
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

are you making sure your focus is right dead on? the focus can be the be all end all when it comes to burning. The easiest way is to get some smoke or fog on teh beam and you will see literally where it comes to a focus. =======>I<======== the "I" in the asci represents your focal point. give it a try.
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Old 09-22-2007, 07:39 PM #4
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

If you are really getting those current readings..then I think it's a focus issue.

160Ma should be plenty of juice to burn...and your higher number is Pushing it....It's not completely out of control high..but watch your ON times....!!!

Focus that beam down to a Tiny bright dot..and it SHould burn very well!!!

other than that...did you open up the back of the black plastic lens???

http://www.laserpointerforums.com/fo...num=1190476363

Larry
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Old 09-22-2007, 07:42 PM #5
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by Gazoo
Something is wrong with your measurements. With a 2.2 ohm resistor and a pair of alkaline batteries you would be feeding the diode appx. 160ma's. The 10 ohm resistor is the problem if I am reading your post correctly..
Hold on.... V = I x R
R = V / I
R = 3.05 / 0.240 = 13 Ohms

????
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Old 09-22-2007, 07:43 PM #6
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

I have double and triple checked, there is no way you can get those current readings with a 10 ohm resistor....2.2 ohms will give appx. 160 ma's.
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Old 09-22-2007, 07:44 PM #7
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by danielbriggs
[quote author=Gazoo link=1190489481/0#1 date=1190489882]Something is wrong with your measurements. With a 2.2 ohm resistor and a pair of alkaline batteries you would be feeding the diode appx. 160ma's. The 10 ohm resistor is the problem if I am reading your post correctly..
Hold on.... V = I x R
R = V / I
R = 3.05 / 0.240 = 13 Ohms

????
[/quote]

You have to take into account the voltage drop across the diode.
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Old 09-22-2007, 07:45 PM #8
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by LarryQ
If you are really getting those current readings..then I think it's a focus issue.

160Ma should be plenty of juice to burn...and your higher number is Pushing it....It's not completely out of control high..but watch your ON times....!!!

Focus that beam down to a Tiny bright dot..and it SHould burn very well!!!

other than that...did you open up the back of the black plastic lens???

http://www.laserpointerforums.com/fo...num=1190476363

Larry

When I first started the focus was a big fat circle - but after tuning it down - I got a super fine dot about 6cm from the lens cap.

And no... I've not enlarged the plastic hole - will do this tomorrow - will this really help?


Thanks,

Dan :-)
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Old 09-22-2007, 07:46 PM #9
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by Gazoo
[quote author=danielbriggs link=1190489481/0#4 date=1190490164][quote author=Gazoo link=1190489481/0#1 date=1190489882]Something is wrong with your measurements. With a 2.2 ohm resistor and a pair of alkaline batteries you would be feeding the diode appx. 160ma's. The 10 ohm resistor is the problem if I am reading your post correctly..
Hold on.... V = I x R
R = V / I
R = 3.05 / 0.240 = 13 Ohms

????
[/quote]

You have to take into account the voltage drop across the diode.[/quote]


Shit....

Totally forgot about that. So what is the voltage drop? I've been testing it like 100 times with a spare UV 5mm LED I had knocking around.

So a resistor swap out it is tonight!


Thanks!










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Old 09-22-2007, 07:48 PM #10
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Can't hurt... ;D

Well...Unless you butterfinger it and drive the exacto knife into your hand..... :P

Just be careful and don't stick the blade in too far..lest you scratch the lens!!!

Larry
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Old 09-22-2007, 07:53 PM #11
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by danielbriggs

Shit....

Totally forgot about that. So what is the voltage drop? I've been testing it like 100 times with a spare UV 5mm LED I had knocking around.

So a resistor swap out it is tonight!


Thanks!

The voltage drop will vary depending on how much voltage is applied! Do the resistor swap and use a 2.2 ohm resistor. It will then burn like crazy...and be careful..it will be super bright!
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Old 09-22-2007, 08:01 PM #12
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Quote:
Originally Posted by Gazoo

The voltage drop will vary depending on how much voltage is applied! Do the resistor swap and use a 2.2 ohm resistor. It will then burn like crazy...and be careful..it will be super bright!

Good job I bought some more low value resistors last time I went to maplins yesterday. I used the last few a week back.

I'll let you all know in the next hour :-D


Dan :-)
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Old 09-22-2007, 08:04 PM #13
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

Hi Dan,
I don't have the Aixiz module you and others do, but you might also want to remove that plastic bit everyone is talking about before you fire it up.
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Old 09-22-2007, 08:59 PM #14
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

There is a thread up and running about how best to open up the hole here:-
http://www.laserpointerforums.com/fo...num=1190476363

I have just tried Senkats method, it is probably safer (lenswise) than my suggestion of drilling it.

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Old 09-22-2007, 09:09 PM #15
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

OMG!

Now that is fantastic!
I'm going to make more of these :-D

Senkat! - 2 more please - I'll add my order to your post asap!
I think a blue would be a bit too ambitious straight away, I'll step it up like this: loads of reds! a few greens, and then try a blue!

BTW: Cheers guys for all your help - I'll be sticking around here for a while!
I'll enlarge the lens hole first thing tomorrow.


Ta!


Dan :-)
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Old 09-22-2007, 09:34 PM #16
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Default Re: It just won't burn!!!!!! SenKat GB in a torch

I'll take that to mean you're burning everything in sight now! ;D ;D ;D
Please take care to burn the everything, and not the sight.
Great it's working. Post some pics!
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