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Old 02-10-2012, 10:28 PM #1
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Default 445nm for the 2nd time

im building a 445nm for the second time

im using a 1W resistor for lm317 driver

i tried hooking it up outside of my mohrenberg host and it seemed pretty good, but i can't seem to get it to focus,
it has a big dot radius and then a small dot in the middle

im not sure if the raw output looks like what it should be

the results dont seem as powerful as what everyone else gets

im gonna assemble it in the host now and see if it works

btw im using these batteries, could they be the reason why its so weak

UltraFire 15266 3.6V 600mAh Batteries (Pair) - Free Shipping - DealExtreme


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Old 02-10-2012, 10:34 PM #2
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Default Re: 445nm for the 2nd time

You are giving not much information about the build.

What current is the LM317 set ?
What lens are you using ? It could be that you put the lens the wrong end in.
How is the raw output ?
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Old 02-10-2012, 10:36 PM #3
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Default Re: 445nm for the 2nd time

Double check that the diode in pressed in counter sunk, and make sure the lens is not backwards. Both are common issues.
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Old 02-10-2012, 11:16 PM #4
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Default Re: 445nm for the 2nd time

woooh success, im not sure how strong it is but it doesnt seem as powerful as what other people post pictures of, doesn't look like it can burn anything =[

a 1W resistor should give me 1 amp right?

perhaps the lm317 is overheating or batteries arent strong enough



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Old 02-10-2012, 11:44 PM #5
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Default Re: 445nm for the 2nd time

You are using cr2's? You know those things probably have like 200mah capacity? AW cr2s are 300 mah.

Plus an lm317 driver drops way too much voltage to use just 2 cells. I have no clue where you are getting this 1W resistor for 1A thing. If you are talking about a 1 ohm resistor then it would give you 1.25A if you had enough voltage and better batteries.
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Old 02-10-2012, 11:56 PM #6
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Default Re: 445nm for the 2nd time

1 ohm resistor whoops sorry

kk what batteries do you suggest for a mohrenberg, i will buy new ones now
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Old 02-11-2012, 12:46 AM #7
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Default Re: 445nm for the 2nd time

I don't know. Mohrenberg has sold many different hosts/heatsinks, you will have to be more specific. (link?)

But I can tell you right now you need a new driver. LM317 needs 3 li-ion batteries to work well with a 445nm diode.
Try one of these:
Mohgasm Linear Driver - $12.00 : Mohgasm!, Because it feels so good.
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Old 02-11-2012, 12:48 AM #8
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Default Re: 445nm for the 2nd time

uhhh its the blue one, iunno what its called hotlights i think?

but anyways, would my batteries right now work with mohgasm's linear driver?
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Old 02-11-2012, 01:09 AM #9
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Default Re: 445nm for the 2nd time

Those cr2's wont work well with anything high current. Maybe 500ma max for those batteries.

You probably want some IMR 16340's from lighthound.com Im pretty sure the hotlight can hold two 16340s.

Here follow this tutorial
Tutorial: ~1.4w 445nm Hotlights kit **PIC HEAVY**
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Old 02-11-2012, 01:12 AM #10
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Default Re: 445nm for the 2nd time

kk so 16340s?

i'd still need a mohgasm driver right?

thanks alot

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Old 02-11-2012, 01:16 AM #11
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Default Re: 445nm for the 2nd time

Yeah.

The only way you could use the driver you have now is if you used the original 3x AAA holder for 3x 10440 batteries. But you would have to lower the current by about half because the batteries couldn't handle 1.25A
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Old 02-11-2012, 01:19 AM #12
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Default Re: 445nm for the 2nd time

alright... so im guessing i'm only getting around 300 mW or less

right now i see a nice beam and it makes my 30mW green and 100mW phr-803t seem pathetic

okay i will buy the driver first thanks again

btw whats the diff between my 15266 right now and the 16340
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Old 02-11-2012, 01:26 AM #13
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Default Re: 445nm for the 2nd time

15266 are smaller and have lower capacity. They cant provide as much current as 16340's.
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Old 02-11-2012, 01:30 AM #14
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Default Re: 445nm for the 2nd time

okay okay, i buy now <3

you have any 16340 batteries you recommend to buy

there labelled 500maH, and they seem around the same as my 15266s

but ill buy some anyways

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Old 02-11-2012, 04:09 PM #15
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Default Re: 445nm for the 2nd time

alright i bought two of these Juice Brand Rechargeable Photo Lithium CR123A Batteries | eBay
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Old 02-21-2012, 09:37 PM #16
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Default Re: 445nm for the 2nd time

okay so i popped in moh's linear driver, but still using 2x cr2 batteries

i still have a weak output

im guessing my diode is zombie'd once again?

*** so if my batteries cant handle 1.25A, would the power be drastically decreased

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