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My 445nm (lab) build

kiyoukan

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Sound good to me.
I have had many ideas for making my own lab builds but i need to get the rest of my tools first.
I got me a band saw a metal lathe up next is my own drill press and table saw.
I have to drive about 5min to use a drill press and table saw kinda anoying so craigs list here i come.
 

andy_con

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Just a guess, but those look like a couple of lenses from the casio projector... The smaller being from the big red LED and the other im not sure. I have mine all wrapped up til I find use.




Why would you isolate >each< LD ? It would be far more efficient to mount the 4 modules solid into the aluminum and then isolate the entire block from the lower plate...

Just mah 2 pennies ;)
if all diodes are touching then if one pops they all pop. also you cant adjust the power of each diode.



in general guys there is a big thread in the red section of this forum about that red build i did. im currently at a festival doing lasers so cant go into great detail now
 

Things

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That enclosure itself looks like it should handle the heat of the diode itself, even without the fan. Have you got layers of thermal paste stacked up there? A common misconception with thermal paste is that more is better, which is not true at all, Infact, anymore than just a thin layer actually starts to begin insulating.

Not saying there are layers of it there, just kinda looks like it, With my 445nm box build, nothing gets warm at all, and no fans needed.



Also, how do you intend on safely charging those lithium batteries? I assume that PCB is the laser diode driver circuitry? Using an external lithium charger?


Cheers,
Dan
 

ped

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That enclosure itself looks like it should handle the heat of the diode itself, even without the fan. Have you got layers of thermal paste stacked up there? A common misconception with thermal paste is that more is better, which is not true at all, Infact, anymore than just a thin layer actually starts to begin insulating.

Not saying there are layers of it there, just kinda looks like it, With my 445nm box build, nothing gets warm at all, and no fans needed.



Also, how do you intend on safely charging those lithium batteries? I assume that PCB is the laser diode driver circuitry? Using an external lithium charger?


Cheers,
Dan
Yeah i hear ya.

Yours probably stays cool because of the big stonking black heatsink it has haha, and pimary tests have revealed the case/mount warms upto about 30c after 6-7 mins on time, so all in all a bit of a storm in a teacup?.
And yeah i know what ur saying, ive applied just enough thermal compound, i remember that n00b mistake from when i was in collage, and got roasted by my tutor for it.

The fan is really just for temp stability should it start warming up.

And psu's and power amps are my speciality...i designed a charger just for this application...and its charged these batts up perfectly, then cut off and trickle charged, many times.

Edit , that looks like a big rheostat you have in there?
 
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if all diodes are touching then if one pops they all pop. also you cant adjust the power of each diode.



in general guys there is a big thread in the red section of this forum about that red build i did. im currently at a festival doing lasers so cant go into great detail now
Are the diodes regulated on the negative side?? :thinking:

Or one driver and all four are in series?

BTW, those optics from a Casio??
 

andy_con

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Are the diodes regulated on the negative side?? :thinking:

Or one driver and all four are in series?

BTW, those optics from a Casio??
each diode is insulated and im running two diodes per driver. so two drivers in total

telescopics are from edmund optics and diode lens are from roithner
 

Things

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Ped, that black heatsink is sealed inside the box, it doesn't even get any airflow. It just serves the purpose of holding the aixiz module. The thermal mass is enough to keep everything cool for a very long time :)

And yes, that is a rheostat. Overkill at 15W, but I got it locally :)

Do you have schematics for the lithium charger? I've always wanted to build lithium batteries into some devices but had no way of charging them properly while they were inside. Don't need any fireballs .
 
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ped

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Do you have schematics for the lithium charger? I've always wanted to build lithium batteries into some devices but had no way of charging them properly while they were inside. Don't need any fireballs .

It was a take on one of Scott Hemion's designs and modified it to work with 18650's , i also dropped the current a bit....and added a feedback resistor to trickle charge it but i do this stuff of the top of my head, i dont really write it down haha
 




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