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Old 08-30-2010, 03:59 AM #1
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Default D-Cell Maglite As Host?

Now that I've finally managed to get it apart, it seems as though the switch assembly in my 3 D-Cell maglite might be capable of supporting a laser diode. I'd have to plug something into the bulb holder, to shore up the wasted space, but I believe connecting the diode's leads directly to the switch and case can work.

Trouble is...though I've tested the batteries AND the diode, I can't seem to get any voltage out of the bulb holder. My voltmeter reads positive current from the two contacts, yet when I connect a 10mW laser diode I get nothing. I have another battery pack, from a smaller light, which powers the diode with three AAA batteries, so I'm certain the power source isn't the issue.

I've also managed to break the LED bulb during this process. Nuts.

Question is...what are the possible causes of this phenomenon? I need to be able to narrow my search down to a few areas, but deductive reasoning has failed me this time.

I could get another cheapie to try again, but would rather not waste money.

Anyone try this yet?


EDIT: All right, I'll chalk this one up to a beginner's mistake. I'm fairly certain that the set screw wasn't fully in place. You know, the one that makes all the difference between "you have a path to negative" and "you don't have a path to negative"? That one.

Also, apparently the bulb is fine.

Trying again with the laser diode.



Last edited by Glitch; 08-30-2010 at 04:13 AM. Reason: Oops.
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Old 08-30-2010, 04:10 AM #2
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Default Re: D-Cell Maglite As Host?

You connected a laser diode straight to the contacts? The diode is probably dead... this is why we make driver circuits for our diodes. You cannot simply connect the diode straight to a power source, it will burn out instantly
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Old 08-30-2010, 05:30 AM #3
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Default Re: D-Cell Maglite As Host?

The diode is a complete laser module, with integrated power supply, which is rated for the load (if I remember correctly).

So...no. I didn't.

Besides, if that were the case, it wouldn't light up (as stated above) when I connect it to another power source. It does.

The problem here is that I just can't quite get the setup to work right when I try wiring the diode to the actual host. I'm sure I'm missing something stupid, which is why I asked. Learn from those who know, no?
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Old 08-30-2010, 06:03 AM #4
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Default Re: D-Cell Maglite As Host?

You have a good connection from laser module to the contacts?
Perhaps use separate wires to the Maglite contacts. That way you can have your voltmeter connected as you add the laser module.
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Old 08-30-2010, 04:03 PM #5
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Default Re: D-Cell Maglite As Host?

I may end up having to just ditch the entire switch assembly. At least, if I add my own, I'll know what's what, and why.

Could probably swap out the battery configuration while I'm at it. Ground to the case? Wtf. Sounds like a great way to short the thing out, if you aren't careful.
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Old 08-31-2010, 01:37 AM #6
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Default Re: D-Cell Maglite As Host?

I will eventually get this thing running, this is a two cell iirc and I want to run three sub-c NiMh . . . Just need to machine the lens housing for the fan to fit and machine the heatsink to fit . . .

The switch is a simple on off . . . I discarded the bulb holder . . .




Last edited by boscoj; 08-31-2010 at 02:46 AM.
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Old 08-31-2010, 03:52 AM #7
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Default Re: D-Cell Maglite As Host?

Thats going to look pretty sweet bosco, especially with that fan set in the mag head
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Old 08-31-2010, 04:08 AM #8
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Default Re: D-Cell Maglite As Host?

thanks man, super sweet with 4600 mah sub-c's . ..



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Thats going to look pretty sweet bosco, especially with that fan set in the mag head
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Old 08-31-2010, 04:34 AM #9
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Default Re: D-Cell Maglite As Host?

Keep in mind, if you have a green module, they are case positive.

You would need to insert the batteries backwards to get the correct polarity.
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Old 08-31-2010, 04:37 AM #10
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Default Re: D-Cell Maglite As Host?

pretty sure I don't have a module . . .
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Old 09-03-2010, 01:27 AM #11
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Default Re: D-Cell Maglite As Host?

I suppose D-size maglites wouldn't make bad hosts at all, even with passive cooling. You just need some heatsink/coupler that fits an aixiz module inside, and fits the maglite body outside.

Using a 6D maglite and 1 watt 445 diode the whole thing could be a very cool project to build and use. The body size is large enough to allow continous operation, and the batteries could provide current for many hours - so it would be a true laser for permanent operation.
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