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Great Info. Thanks!!

A pencil eraser works well for contact cleaning. Batteries should never be left in items long term. Bad batteries can sour in weeks.

Hello, I am reading this thread because I am searching for a driver board for the NUBM31 and I need to know why you selected 14 Ohms as the test load resistance output value for your testing. Thanks.

See what it's like when you receive it and scrutinize for scratches, screw head nicks, etc. If it works and it is accurate, who knows how the seller acquired it. He's got more than one for sale. Maybe they're just trying to get top price for something they didn't pay much for. Report back what...

Hello. Yes, I am currently using a benchtop current regulated supply, which I have opened up the current to max (5A unrestricted no limit), and I only adjust the P/S voltage input to the SXD to 7.4V allowing the SXD driver to handle the output requirements. I have swapped in a new NUBM44 using...

Thanks. I bought a few to play around with, appreciate the help.

I was comparing the sellers' images from the link you gave. I just wasn't aware of the double-stacked R500. Here are the images from the seller. Two R500's? I see one. Where is the other? Thanks.

I'm sorry. Can you point to the "front single R500"? I am looking at the pictures. I do not have one in hand. I see only an R500 as top resistor on the (2) stacked pair, I am assuming that is the "back" because of this statement: "On the back side are 2 resistors on top of each other. You only...

Boris, I read the thread of your build of the 74W NUBM35. Thats awesome. There is a lot of great info there provided by everyone involved. So, I am checking out this laser driver that you are showing me, and out of the box it is rated at 4.5A, which is good. But I do not understand your mods...

Google IrfanView App for manipulating image sizes, etc. It's a free program, it works very well, and I have used it for close to 20 years.

Thank you for the info, safety and operational concerns. I have heeded everything that you mention, heatsinked SXD, Properly Heatsinked NUBM44, and my SXD output is 3.067A @ 4.2V, so I am in your output range. Nominal voltage for an 18650 or a 16340 is 3.7V x 2 = 7.4V or x 3 = 11.1V. So, I set...

Thanks.

Do you think that the 4A SXD Super X-Drive Laser Driver would underpower this diode? I ask because I currently have that SXD driver running a NUBM44 and it is outputting 3.067A @ 4.2V to the diode with 8.4V on the input V+. I feel like the NUBM44 is underutilizing the SXD (by 1A). It seems to me...

Compact Hand Held.....

So, is there a recommended "Driver" for this diode?

BTW, Nice collection of laser paraphernalia....

Thanks. This is the heatsink I have it set in. It's part of an assembly with an SXD Driver, separate polarity protection, battery compartment/switch.

I'm new and I don't know exactly what to expect. I have an operating SXD Super X-Driver running a NUBM44. I am power inputting the SXD driver with a regulated power supply capable of 0v-30v and 5a. I set the input to the SXD drive at 8.4v and it draws 2.27A from the power supply. Increasing the...

Thanks for that bro. I have seen the divergence that you mention, from my "second" NUBM4... I did purchase some "real" laser glasses, not a "give away" pair. I can barely see the blue light with the real pair.

Hello everyone. I wish you all the best and I hope life if being good to you. I've been involved with electronics most of my life and have only tinkered with lasers up until around November of last year. Then I started realizing that lasers can do some cool stuff and there is a lot to learn from...