425nm build (GH04I01A2G)

[Paulostool]

Found some 3W 425nm pointers on AliExpress and got thinking what could be the diode used on them.

Them I found a cheap GH04I01A2G and decided to try over-current it as I think this may be the diode, calculated about 1.5A for the 3W and gave a try! No issues so far!

I really liked how the 420nm build turned out, so this was built into another Convoy T3, brass this time! Now I have purple twins

Again I reduced a DTR 20mm copper module to 18mm, modded the convoy 6v 2a driver to 1.5a with a 25 milliohms shunt, some body adjustments and thermal compound to transfer heat a little better to the brass head.

The driver is capable of driving the LD at 1A and 1.5A, at lower power the color it’s definitely purple very similar to my 420nm but at 1.5A the color drastically shift to blue!
Color shifting lasers are amazing additions to the collection.

I will take beam shots and spectro reading later

 

[Ricker]

Very nice!

 

[sirfrank]

Really cool build!
I've scoured the web for some info on that exact shunt mod with no such luck. If you had any info to share. You'd be doing a newbie a great favor!

 

[Paulostool]

Really cool build!
I've scoured the web for some info on that exact shunt mod with no such luck. If you had any info to share. You'd be doing a newbie a great favor!

Are you planning to mod the 2a boost driver?

It comes with a 20mohm shunt for 2a, those have a inversely proportional relation.

40/X formula will give you the output current in amps with a Xmhom resistor.

Expected output:
10mhom -> 4a
20mhom -> 2a
25mhom -> 1.6a
40mhom -> 1a

After the modification with the 25mhom shunt I measured the real output at ~1.5a, but that was good enough for me.

 

[sirfrank]

Thank you sir! I am now!

I had a few left over from some other builds. But didn't know I could repurpose the driver's safely. I figured it wouldn't supply a clean current.

Got a NUBM08 that could be a candidate if my tests look good.