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Old 05-28-2013, 08:23 PM #1
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Post compatibility of parts/diode question

i will be constructing a 445nm blue laser, but before i purchase all of the components and assemble the device i need to know with 100% accuracy that these components are compatible. if any of you fine individuals own any of these parts it would be grand if you gave in your opinion's on the quality/performance of any of them.

we will start with the diode, as this is what i am most unsure of.

i own a 1 watt o-like 445nm laser (old design) utilizing the xj-a140 diodes, BTW i will be posting a finalized review of it, almost 2 years in the making. fascinating things i will include you may or may not already know. anyway there appears to be 3 types of diodes, the nichia NDB7875, and the unknown diodes used in the XJ-M140 projector and one only known as the H1600.

as of now the diode im most interested in is the NDB7875
i have the specification sheet for the NDB7875 diode, which has a typical output power of 1.6 watts and a maximum current of 1.7 amp's.

my question is are any of these diodes TRULY rated for 2 watts output power? or do you guys just drive them with currents exceeding the maximum stated in the specification sheet. if this is the case how long do they typically last and is there a reduction in diode life that occurs? for example if i was to not adjust the driver and leave it set on 2 amps, would the diodes life be reduced and would i not be able to keep it on for long periods of time?

also how do you guys usually adjust your drivers current? do i just set my multimeter to amps?

here is the host: DIY Stainless Steel Host Assembly, Extended and Tapered Heat Sink, Unmarked

i plan on using a single 18650 lithium ion

here is the driver
Adjustable 2W 445nm/445nm blue laser driver circuit/ 2A/Round [OL-445-2AD] - $14.99 : Zen Cart!, The Art of E-commerce

the idea i have is to solder the negative of the driver to the brass retainer which comes in contact with the pill and case.

diode will be put into an aixiz laser housing with the copper replacement for the brass and a glass lens.


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Old 05-28-2013, 09:52 PM #2
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Default Re: compatibility of parts/diode question

Quote:
Originally Posted by iminyourbasement View Post
as of now the diode im most interested in is the NDB7875
i have the specification sheet for the NDB7875 diode, which has a typical output power of 1.6 watts and a maximum current of 1.7 amp's.
These NDB7875 9 mm diodes can be driven up to 2.4 A and will generally give over 3 W. Some have hit 3.7 W - see Ricktrent.

M140's will also get up near 3 W I think a couple have actually hit 3 W. Anyway the majority will give between 2 and 2.5 W at a max safe current of 1.8 A.

Yes we exceed the specifications!

Quote:
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also how do you guys usually adjust your drivers current? do i just set my multimeter to amps?
Test load see Jufran, Mohgasm or Flaminpyro

Quote:
Originally Posted by iminyourbasement View Post
diode will be put into an aixiz laser housing with the copper replacement for the brass and a glass lens.
You'd be better off with a 9 mm copper module from Mohgasm.com. Aixiz is nickel plated brass and wont conduct the heat away as well.

Rest sounds ok
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Old 05-28-2013, 11:16 PM #3
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Default Re: compatibility of parts/diode question

The only way you can have 100% accuracy is to do the research yourself and make your own informed decision. Not only does this put you mentally at ease, it also gets you more personally acquainted with all of the parts.
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Old 05-29-2013, 02:15 AM #4
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Default Re: compatibility of parts/diode question

thanks for all the help guys!
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Old 05-29-2013, 03:04 AM #5
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Default Re: compatibility of parts/diode question

Good luck.
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Old 05-29-2013, 08:49 AM #6
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Default Re: compatibility of parts/diode question

Hi!

I just finished a very similar build on friday!

I ordered the diode from DTR, already in a module and with a 2.1 A X-Drive (buckdriver) and a G2 lens.


9mm 445nm "Blue Mysterio" (with burning video & beamshots)


And here many, many questions were answered. About the 9mm 445nm diode, the host you are going to use and many more!

Many questions about first 9mm 445nm build!


Maybe this will help you somehow!


Cheers brunes01
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Old 09-24-2013, 10:10 PM #7
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Default Re: compatibility of parts/diode question

@iminyourbasement, it's a little difficult to answer this because all the components that you'll be using are not all used by people in general. When you're talking about rating they are mostly exactly what’s mentioned on the datasheets, you won't find out that a transistor rated 1W on datasheet got blown up on 1W. Also, if you're talking about a 2W transistor, it isn't that big of a requirement. Most of the transistors are capable of passing a 400mA current at 5V. But despite all this always try to order components having double the ratings in the datasheet when you're ordering them so that you never have to risk operating them on the edge of their maximum specifications.
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