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Old 06-19-2014, 07:00 AM #17
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Default Re: 650-660nm Mits laser diodes

I'm not set up to fabricate this board. If you can do it or know someone who will do it I would be interested in about 5 of them to start. I can come up with the parts, but the board, that's another story. It's been years since I was fabricating PCBs and don't have any of what is needed to do it.


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Old 06-19-2014, 07:15 AM #18
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
I'm not set up to fabricate this board. If you can do it or know someone who will do it I would be interested in about 5 of them to start. I can come up with the parts, but the board, that's another story. It's been years since I was fabricating PCBs and don't have any of what is needed to do it.
I can't, sorry - not up for manufacturing things. But you can do - to do it really cheaply only takes an oven, and $3 worth of solder paste from eBay

However, there's a problem with my design that just occurred to me. Well, actually, the design is fine, but the diode we're powering creates a problem. The diode's Vf is under 3V, and the ZXCT needs 3V to run, so we're probably going to see bad behavior here (or no regulation at all because the ZXCT won't have enough juice to operate). Two possible solutions:

1) Instead of the ZXCT, use the MAX4172, which has a dedicated pin for pulling its own V+ power supply from the battery, pre-LM1117

2) Try moving the ZXCT to pre-LM1117 itself. Since the driver is linear, this might work. But it might not, and I've never tried it.

I like option 1 best.
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Old 06-19-2014, 07:19 AM #19
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by rhd View Post
I can't, sorry - not up for manufacturing things. But you can do - to do it really cheaply only takes an oven, and $3 worth of solder paste from eBay

However, there's a problem with my design that just occurred to me. Well, actually, the design is fine, but the diode we're powering creates a problem. The diode's Vf is under 3V, and the ZXCT needs 3V to run, so we're probably going to see bad behavior here (or no regulation at all because the ZXCT won't have enough juice to operate). Two possible solutions:

1) Instead of the ZXCT, use the MAX4172, which has a dedicated pin for pulling its own V+ power supply from the battery, pre-LM1117

2) Try moving the ZXCT to pre-LM1117 itself. Since the driver is linear, this might work. But it might not, and I've never tried it.

I like option 1 best.
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Old 06-19-2014, 07:30 AM #20
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by IsaacT View Post
What is simple for you sounds like wizardry to me.
Thank you sir

Anyway, I'm off to bed. I don't actually need this circuit, so I'm not going to make any. But if others want to make use of it, that's okay with me. Fix the ZXCT issue from 2 posts up though, especially if planning to use this for diodes with Vf's around (or under) 3V.

Having quickly glanced at DigiKey offerings, I think I'd probably actually swap out the ZXCT for one of the following two chips (both of which take a voltage input from pre-regulator, so that the Vf of the LD doesn't impact whether they have the 3V they need to run:

- MAX4073T/F/H
- SC310
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Old 06-19-2014, 08:06 PM #21
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Default Re: 650-660nm Mits laser diodes

rhd, yeah, the LD is driven by Vf=2.5 volts max. I will look into what you have described and see if I can make it work, but in the mean time, I must deal with what I have to get some of these builds off my plate. Thanks, man. Maybe after the day is over we can talk about it some more. Paul
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Old 06-20-2014, 04:47 AM #22
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Default Re: 650-660nm Mits laser diodes

Tracking !!! Very interesting !! Very interesting indeed !!!
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Old 06-21-2014, 12:40 AM #23
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Default Re: 650-660nm Mits laser diodes

Thank you for the tip! I just bought two of these and I have a host sitting around that will fit one nicely. I only need one of these diodes, but considering open can red laser diodes HATE me I decided to get a second as a backup.
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Old 06-21-2014, 04:46 AM #24
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Default Re: 650-660nm Mits laser diodes

Here's a good page with lots of pictures comparing the LPC-840 with the LPC-836. Apparently the
Mitsubishi part number is ML202F40-55. There are no good closeups and not even a datasheet yet.
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Old 06-21-2014, 05:18 AM #25
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Default Re: 650-660nm Mits laser diodes

Thank you, LS. I sent for a price and what quantities need to order to get each price break. Maybe it could be worth either stocking, or having a group buy. I will let you know what I learn. Paul
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Old 06-21-2014, 06:13 AM #26
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Default Re: 650-660nm Mits laser diodes

Just bought two of these guys. I can add them to my growing collection of red diodes.

2 x LPC-826
2 x GGW 660
2 x LPC-840*new*

Why I need all of these I will NEVER know. I have more diodes than hosts and no host budget in the current foreseeable future.
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Old 06-21-2014, 06:25 AM #27
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Default Re: 650-660nm Mits laser diodes

Isaac, yeah, I've got about 20 red laser diodes and not nearly enough hosts for them all. I just like red diodes and I will eventually use them in something. I've got two of those cheap FASTTECH flashlight builds in the process. One is for me, and the other is for Jeff ( vortish ). Hope to have them both finished this weekend. I've also got another LPC-840 coming for a build for another forum member. Then I have my 2 watt Nichia build I'm putting in an MS Envy. So, I've got plenty to keep me busy.
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445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM
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Old 06-21-2014, 06:32 AM #28
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Default Re: 650-660nm Mits laser diodes

My Hosts:
Kryton 5.6mm Host
Kryton 9mm Host
Ehgemus Diode Pocket 5.6mm Host

My Diodes:
9mm 455nm Diode w/ Driver
GGW 660nm Diode w/ Driver
1x GGW
2x LPC
1x PHR
2x 808nm 1W 9mm Diodes
2x 532nm Modules
1x 9mm 445nm Diode w/ Driver - 700mW(messed it up a bit)
1x CNI 400mW Module(no driver or CL)
1x 6W 445nm Diode w/ Driver(no host yet. In progress)

So as you can see I am in a similar boat. Only one completable project. And flexdrives are expensive lol.
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Old 06-22-2014, 06:07 AM #29
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Default Re: 650-660nm Mits laser diodes

Just heard back from Mitsubishi and they are not giving these diodes away by any stretch of the imagination. They want $12.00 each for 10 units. That is not as good as the ten on eBay for $99.99. To match that price we would have to buy 50 units. Now if anyone wants 100 units the price drops to $8.00 each. Personally, I would be more inclined to buy off of eBay and get ten units for $100.00.
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Old 06-22-2014, 05:49 PM #30
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
So, if you remove all but one, you will have a 350mA driver. The link is" 3pcs 1A 3W LED Driver Circuit Board Module C C No Modes CREE SSC DIY | eBay.
To bypass one of the ic's can you just solder a wire across the 3 pins?
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Old 06-22-2014, 06:04 PM #31
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Default Re: 650-660nm Mits laser diodes

bdgreenb, come to think about it, yeah, that would work, too. I already took two off of one of these drivers and they stick pretty close to 350mA out per driver I.C. I needed something with a little less current and found that a 2.2 ohm resistor in series with the negative lead to the laser diode (though t probably doesn't make a difference which side you put it on) gives me about 300mA instead of the 350mA.
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Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 1.75 watts SkyRay Gifted
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM
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Old 06-22-2014, 06:09 PM #32
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
bdgreenb, come to think about it, yeah, that would work, too. I already took two off of one of these drivers and they stick pretty close to 350mA out per driver I.C. I needed something with a little less current and found that a 2.2 ohm resistor in series with the negative lead to the laser diode (though t probably doesn't make a difference which side you put it on) gives me about 300mA instead of the 350mA.
Out of curiosity, why not just use a flexdrive?
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