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Old 06-22-2011, 10:31 PM #305
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

I am not sure this is definite but according to Kaidomain the NJG has been discontinued. I see they are sold out on DX as well. If they really are gone I wonder if they were pulled for exploding drivers?.



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Old 06-22-2011, 11:22 PM #306
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

Thanks for the tip, DTR. I just topped off my stock in case this is the end of the NJGs. Quite a few builds are now designed around them
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Old 06-23-2011, 01:37 AM #307
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

Well this sucks. Though the cavity in my sipik's are big enough to stuff most drivers in. So at least I don't have to redesign. the NJG-18's were certainly convenient and cheap though, even if they weren't optimum for the application. Maybe I should try to develop my own boost/buck driver for them. Shouldn't be extremely hard, Not like trying to build something micro flexdrive size.
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Old 06-23-2011, 01:44 AM #308
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

Time to put the squeeze on Jib to get crackin on the JibBoost.
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615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
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Several 635nm diodes awaiting a build
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Old 06-23-2011, 04:07 AM #309
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

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Time to put the squeeze on Jib to get crackin on the JibBoost.
ouch, don't count me out. Ordering parts for mine in the next day or so for first protobuild. =)
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Old 06-23-2011, 04:13 AM #310
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

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ouch, don't count me out. Ordering parts for mine in the next day or so for first protobuild. =)
Ok, bring it on! The more the merrier. I don't want to see another boost driver famine ever again.
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615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC

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Old 06-23-2011, 04:32 AM #311
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

I'll likely attempt one as well but that's fairly low on the to do list for me. I need to get a large stock of my sipik hosts finished so I won't have to spend every night standing in front of the lathe.
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Old 06-23-2011, 06:56 AM #312
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

LOve the use of the PIC 12f629 microcontroller in the the driver, albeit I'd use one also just because they are easier to set a frequency up with then some other oscillator, at any rate if someone has either the reverse engineered schematic for one or a broken one, I'd be more then happy to try and see what I could do to either design or make boost drivers for LPF, but since I'm new and DX is out and so are some of the others I'm sort of stuck with only the knowledge of how to make a boost converter which isn't all that great for small builds due to larger current draws.
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Old 06-23-2011, 03:56 PM #313
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

If your going to the trouble of designing a boost driver for laser use.. there is ZERO point in trying to make a clone of the NJG-18. It's a CV driver and from looking at the datasheet of the regulation IC it uses.. it'd be extremely difficult to convert it to a CC driver.

And boost drivers will ALWAYS have large current draws. Even if it was possible to manage 100% efficiency, the lower the source voltage, the more current it would need to maintain the output.

Here's an example.

Say you had a diode that draws 1A at 5V (just for easy math) That's 5W of total power. Even with a 100% efficiency driver.. which isn't possible.. The input would still require 5W. So if your source was say.. 4.2v.. The driver would have to pull 1.2A to maintain that same 5W output.

As source voltage drops.. it will get worse.. Say you wanted to run the same driver off a some type of single alkaline or lithium primary.. at 3V input, it would need 1.66A to maintain the output.. at 1.5V input, it would need a whopping 3.33A to maintain a 5W output.

The fact that it's impossible to make a 100% efficient driver also compounds the problem greatly. 'good' drivers generally run in the 70-90% range across their tolerated voltage input range.. And some drivers are much much less efficient.
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Old 06-23-2011, 04:06 PM #314
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

I was just making the suggestion since everybody liked them plus with the fact that it is using a microcontroller means, as long as theres code space and pins available we could ad as many features in as allowable.
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Old 06-23-2011, 04:11 PM #315
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

It is not that we like them so much but more that they are our only real boost based alternative to the flexdrive.

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Old 06-23-2011, 04:15 PM #316
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

The microcontrollers these use, even if they're PIC's, are generally cheap single write flavors. IF you want to modify one you usually have to replace it with something else. Besides, the modes are just negative side PWM anyway. It really has nothing to do with the actual regulator, which is why they're easily disabled. If your driver is able to be disconnected from the diode even momentarily without it going poof or it causing the diode to fail.. modes can be added fairly easily.
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Old 06-23-2011, 05:44 PM #317
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

If they work ok, does everyone tend to like the idea of modes provided they're not stupid? Personally, i love the thought of being able to change my laser between low and high powers, and i really like the idea of a strobe.
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Old 06-23-2011, 06:12 PM #318
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

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If they work ok, does everyone tend to like the idea of modes provided they're not stupid? Personally, i love the thought of being able to change my laser between low and high powers, and i really like the idea of a strobe.
Do you mean modes in a newly designed CC driver? I love having the modes when I use a njg on a build. Its just a PITA when setting them up.
As long as the new drivers have the option of disabling modes, id be all for it.
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 06-23-2011, 06:14 PM #319
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

I think most people are ok with modes as long as they aren't overboard. I think my ideal would be a 'low-med-high-variable rate strobe' That way people could set the strobe rate to whatever they wanted it to be.
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Old 06-23-2011, 06:33 PM #320
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Default Re: NJG-18, multimode boost driver for 445nm.. and possibly 650nm

Quote:
Originally Posted by qumefox View Post
I think most people are ok with modes as long as they aren't overboard. I think my ideal would be a 'low-med-high-variable rate strobe' That way people could set the strobe rate to whatever they wanted it to bed.
That would be perfect! I would love to have a programmable strobe rate.
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Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
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Radiant Alpha 2W LPMSOLD=Now in Kuwait!
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