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Old 05-13-2013, 03:09 AM #1
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Default Is it possible to "Boost" the voltage in such a small host?

Update 5/23/13

Well I made a joule thief circuit to try and up the voltage to the LD in MiniMe...

Yes, quite possibly the ugliest laser job ever

The results were sort of interesting and seem to reflect what the Joule Thief is supposed to do. I fried the diode btw. Phenol tried to tell me it probably wouldn't work but I had to try it anyway

Initially when I hooked it up to the original batteries it just gave a very faint glow, but the batteries were running kind of low so I hooked it all up to a 16340. That was interesting. At first there was still the same faint glow, than a bright flickering and then nothing. I had even thought of going back to Radio Smack to pick up a voltage regulator, but noooo, I was in to much of a rush.

The joule thief builds up a magnetic charge in the coil and then ***** it as current back into the circuit as voltage spikes, it fried the diode when that happened. With a voltage regulator I probably could have saved the diode. I'm tempted to tear apart another cheapy laser but I have some diodes on the way from one of the very kind Vets, so I'll be patient and wait...

I have another smaller toroid hand wound already and I'll get a 4v regulator if I can. I'm waiting to pick up a better soldering iron too. It's rather sad I know, but it Lased momentarily so that was kind of encouraging.

~ LB

_______________________________________________






The LD is being direct driven by the 4 button cells at 1.5V. this is half the voltage the LD had in its original host. 4 x AAA 2 in series for 3V I believe.

Is there anyway to boost the voltage to 3V in such a small host?

I thought that stacking button batteries would add the voltages of the individual batteries, but that's not what's happening. I get the same voltage 1.9V from one battery and 1.9V from all four stacked in the host. I used this as reference...
http://www.technologystudent.com/elec_flsh/button1.html

update... (Skip these if you want)

Found the joule theif online...


http://electronics-diy.com/led-flashlight-1.5v.php

looks close, but kinda big.

joule thief circuit video

making a joule theif

Hmm, interesting. Apparently the ferrite core is not necessary...
http://www.youtube.com/watch?v=pQi6U7tgVwM

Ok a nice instructables article, trip to Radio Shack and find a dead CFL for the toroid.

http://www.instructables.com/id/Make-a-Joule-Thief/

Hmm, lasers run on drain cleaner and aluminum can tabs
http://www.youtube.com/watch?v=tIGTRdmXT5s

This kid made a Tiny joule theif, looks possible...
http://www.youtube.com/watch?v=guX9g...endscreen&NR=1

I have a feeling this is similar to what the boost/buck drivers do. interesting stuff

__________________________

Ok this enhanced back EMF Joule thief I think is the one to go for...

http://www.youtube.com/watch?v=BC2MK...384B7FB4BD870E




~ LB


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Last edited by Lazerbeak; 05-24-2013 at 05:41 AM. Reason: update 5/23/13
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Old 06-11-2013, 02:41 PM #2
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Default Re: Is it possible to "Boost" the voltage in such a small host?

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Last edited by Zathras; 10-05-2014 at 02:48 AM.
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Old 06-11-2013, 02:51 PM #3
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Default Re: Is it possible to "Boost" the voltage in such a small host?

Dude 4x 1.5v button cells is 6v. You don't need a joule thief, the batteries simply can't supply enough power for the diode. Use the aaas instead.
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Old 06-11-2013, 05:10 PM #4
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Default Re: Is it possible to "Boost" the voltage in such a small host?

Thank Zathras!!! Benmvw is right though, unfortunately those button cells don't work

Luckily Master Jayrob has saved the day He has 3 awesome threads which teach how to boost those tiny builds up to 200+ mw!!!

Follow the links in this recent post where he pointed out the viability of the 10180 Lithium batteries to power a LD...
Laser Contest #1 - Best Laser under $100

Or this one showing a CR2 build...

FS: Key Chain CR2 Build Kit! - SCHWEET!

I'm really stoked as I had put this project on the back burner for a while and didn't think it would be possible.



~ LB
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Old 06-11-2013, 05:38 PM #5
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Default Re: Is it possible to "Boost" the voltage in such a small host?

It's a neat project to toy with, but it's horribly impractical as an actual power source. It's inefficienct, has no regulation of any kind, and is incredibly noisy (electrically).
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Old 06-11-2013, 06:05 PM #6
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Default Re: Is it possible to "Boost" the voltage in such a small host?

Agreed Cy, didn't get the results I wanted and blew the diode in the end I guess that's why they always show LED's and CFL's in the vids. Was kind of neat wrapping the coils though

~ LB
__________________
"There are monkey boys in the facility."
How To Get Along and Be Accepted at LPF ~ click here If you don't like to read.
How to safely lase by Sigurthr
Donate to LPF
"The Collection"
The 3 Furies ~ by Master Photon Wizard Daguin (blk C6 hosts w/ Mrcrouse FR)
Alecto 405nm
Tisiphone 445nm
Megaera 660nm
Gram (Wrath) 445nm ~ an SBA Lasers Custom Build (polished Kryton host 9mm 445nm)
Malice ~ an SBA Lasers Custom Build (Sinner MS-SSW host PL520)
MXDL host 56mw Fasttech green Pman custom build
B&D host "Dominator" 103mw Fastech green Pman custom build
Gordon host 33mw Fasttech green Pman custom build
Dr. Evil & MiniMe (SL Twintask host 660nm Mrcrouse HS & FR - in dev)
Daguin Mini Red
Deadeye Lasers Sirius 445nm Blue
AnselmoFanZero MLG-01 445nm Blue
Pman Silver Pen 642nm


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