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Old 06-07-2010, 01:28 AM #177
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Default Re: Mario's class IV 445nm Kryton + projector pics

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Originally Posted by jayrob View Post
That's what I figured... That the battery was shorting. Because cheap China P7 flashlights put 2800mA's through a cheap tail clicky...

Glad you found the problem!






I like to always get the negative connection to the driver input from the pill when ever possible...

But in certain builds (like Kryton's and pens), it's easier to get the negative from the diode case pin.

However, with a Micro BoostDrive, you cannot just solder the diode case pin to the negative pin like you can with a FlexDrive and connect both to the driver negative output...

You can do that with a FlexDrive because both negatives (input and output), are basically one and the same. They are continuous...

But a Micro BoostDrive is not that way.

The answer, in such a build like a Kryton. Is that you can connect a wire to the diode case pin (with case neutral diodes), and then connect the wire to the input side of the Micro BoostDrive. But obviously you must still also connect the negative output from the driver to the negative diode pin. (and positive output to diode positive) This will work...
Ok, I see what you are doing. This makes sense now, thank you.
So what you are saying is that when using the Micro Boost, the diode cannot simply be made case negative like with the Flex, so you are using the diode's neutral case as the driver's negative input connection. That is what I figured, but I'm a "visual learner" I suppose.


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Old 06-07-2010, 02:00 AM #178
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Default Re: Mario's class IV 445nm Kryton + projector pics

You got it...

Not that I am doing a Kryton build. I mentioned this when just thinking about a Kryton build. Because I sold an awesome blue/black marbled Kryton to Dave a while back and was really regretting in now that we have these 445 diodes.

I'm sure you'll see an awesome picture of Dave's build in a couple of days...
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Old 06-07-2010, 06:46 AM #179
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Default Re: Mario's class IV 445nm Kryton + projector pics

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Originally Posted by MarioMaster View Post
Oh and for anyone wondering, I found out that the clicky switches in my kryton were in fact due to a short - the springs were too long and would kink to the side when I pressed hard on the switch causing the spring in the switch to melt itself. I've shortened the springs and the laser works perfectly now (with the last clicky switch I had)

Cool good to know.

I must admit it sounded quite strange that you burnt the clickies out at only 1.5A.

However another thing that got me thinking and start pluging numbers in itself was the 1.5A figure.

Lets give the diode a "high" Vf of 5.0V@750mA = 3.75W of input power.

The microboost is ~83% efficient IIRC= ~4.5W input power

To extract 4.5W from a fresh 18650@4.2V = a current draw of 1.071A should be seen

For a discharged battery on its lasts breath @3.6V the current draw should be in the area of...1.25A

What the numbers are telling me is that unless a battery is used way down to the 3.0V level (cut-off is 3.6V IIRC), a current draw somewhat lower than 1.5A should be expected. Which combined with your news has made me a happy man. How were you measuring current btw?


One thing that has been "worrying" me is the Vf of these diodes, I have yet to receive mine and take actual measurement, as a result I have been relying on data found here and on PL. I have heard everything from 4-5V. With the flexdrive this isn't a problem, however with the microboost it does arrise. A freshly charged 18650 is 4.2V, the problem is that at lower currents the diodes Vf is probably very close to, if not lower than the figure. As the microboost is a boost only driver, this could lead to problems, when testing lower currents with a fully charged battery.


Having ordered the microboost myself, I plan on putting it through extensive testing on the o-scope. I will also examine parts and IC's doc lava is using, maybe I will get away with more than 750ma due to the lower Vf of this diode.


This sure is an exciting time for this hobby.


Dave: I thought we were already friends.




Best Regards,
brtaman
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Old 06-07-2010, 06:53 AM #180
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Default Re: Mario's class IV 445nm Kryton + projector pics

I have my first 445/Micro BoostDrive build set at 475mA's and the diode is only taking 3.91 volts...

This is from a fully charged 18650. Although the Micro BoostDrive is only a 'boost circuit', it still is working fine and very stable in this configuration...

I'm sure we may find diodes of differing efficiency and forward voltage readings. And I would imagine that at higher currents, the voltage demand from the diode will be more...

Anyway, it still works very stable... (I'm sure the battery voltage instantly sags a little as soon as the laser comes on)
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Last edited by jayrob; 06-07-2010 at 06:50 PM.
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Old 06-07-2010, 02:03 PM #181
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Default Re: 445nm "sled" pics

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Because the beam quality isn't bad enough as it is?
Bad or not, I'm in
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Old 06-07-2010, 04:25 PM #182
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Default Re: Mario's class IV 445nm Kryton + projector pics

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Originally Posted by brtaman View Post

Having ordered the microboost myself, I plan on putting it through extensive testing on the o-scope. I will also examine parts and IC's doc lava is using, maybe I will get away with more than 750ma due to the lower Vf of this diode.




Best Regards,
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Im running one @ 900mA
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Old 06-07-2010, 06:47 PM #183
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Default Re: Mario's class IV 445nm Kryton + projector pics

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Originally Posted by jayrob View Post
No no... not to negative output!...

I like to always get the negative connection to the driver input from the pill when ever possible...

But in certain builds (like Kryton's and pens), it's easier to get the negative from the diode case pin.

However, with a Micro BoostDrive, you cannot just solder the diode case pin to the negative pin like you can with a FlexDrive and connect both to the driver negative output...

You can do that with a FlexDrive because both negatives on the driver (input and output), are basically one and the same. They are continuous...

But a Micro BoostDrive is not that way...



The answer, in such a build like a Kryton, is that you can connect a wire to the diode case pin (with case neutral diodes), and then connect the wire to the input side of the Micro BoostDrive. But obviously you must still also connect the negative output from the driver to the negative diode pin. (and positive output to diode positive) This will work...
Just to make sure we're on the same page, if using a microboost....



Correct?
Attached Thumbnails
Merged 445nm Pictures and Video Thread-445.png  

Last edited by mfo; 06-07-2010 at 07:08 PM.
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Old 06-07-2010, 06:53 PM #184
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Default Re: Mario's class IV 445nm Kryton + projector pics

Yes that will work for a Micro BoostDrive in a situation where it is difficult to get the negative feed to the driver negative input from the pill... (such as with a Kryton build, or a pen)

As long as the module is connected to the host, the diode case will be negative. And the diode case pin can then be used to feed the driver input... (with case neutral diodes only)

Good drawing!
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Take a look at some of my more popular kits linked in color...

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* FS: New! 1000 Lumen XML-2 Maglite Modification With Voltage Monitor! - Parts or Complete Light! Must see!

* FS: Polished Stainless Steel Green Kit! Easy assembly in minutes!

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Last edited by jayrob; 06-07-2010 at 06:56 PM.
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Old 06-07-2010, 06:54 PM #185
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Default Re: Mario's class IV 445nm Kryton + projector pics

Quote:
Originally Posted by jayrob View Post
Yes that will work for a Micro BoostDrive in a situation where it is difficult to get the negative feed to the driver negative input from the pill... (such as with a Kryton build, or a pen)

As long as the module is connected to the host, the diode case will be negative. And the diode case pin can then be used to feed the driver input... (with case neutral diodes only)

Good drawing!
Thanks, now I'm not so intimidated by the microboost drive anymore. +1.

Last edited by mfo; 06-07-2010 at 07:09 PM.
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Old 06-07-2010, 09:38 PM #186
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Default Re: Mario's class IV 445nm Kryton + projector pics

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Originally Posted by JellyCrab
Eh...sorry but...why was the not used pin...used...and connected?
Refer to the diagram + read that jayrob said.
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Old 06-07-2010, 11:08 PM #187
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Default Re: Mario's class IV 445nm Kryton + projector pics

Its just like hooking a 12X to a Rkcstr driver and using a case negative host. If I am not mistaken you can make the diode pin go to the + or - power input for the driver. That way you can rearrange your battery configuration if you want (case positive or case negative)
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Old 06-08-2010, 03:13 AM #188
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Default Photos and Video of 445nm

I did not see a thread specifically for this. It may be handy for everyone to post their pictures and video here to have it all in one meaty thread. Feel free to use this for this purpose. Here are some videos and images from my build. It is only 150mW at 445nm but VERY bright. The other 2 lasers are a 140mW 473nm, and 750mW 405nm.
Imageshack - img0679.mp4 - Uploaded by Yobresal
Imageshack - img0680.mp4 - Uploaded by Yobresal
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Old 06-08-2010, 03:19 AM #189
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Default Re: Photos and Video of 445nm

The comparison shot is brilliant, thank you! Awesome job with the videos too.

I'd rep you if the system would let me.

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Old 06-08-2010, 03:29 AM #190
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Default Re: Photos and Video of 445nm

yobresal! cant believe u got it built after kingdave lol i thought u would skip work just to get ur hands on these diodes a couple of hrs sooner lol... thx for the vid! u always amaze me with ur vids

btw, i thought these were >500mw?
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Old 06-08-2010, 03:42 AM #191
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Default Re: Photos and Video of 445nm

Wow, even with the wider beam the 445 still looks really close to the 473 in brightness. That is a very nice pic of some awesome builds!
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Old 06-08-2010, 04:04 AM #192
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Default Re: Photos and Video of 445nm

In real life the 473nm is much brighter
@oikos thanks and yes it can go up to 500mW and past that but this driver will not go there. Not to mention there is hardly any heatsinking in this laser so it would be ill advised to go past 200mw in it.
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