FS: ***MXDL Custom Machined Heatsinks***

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

[quote author=jayrob link=1202452073/165#174 date=1205180241]

be very careful with the handling of the open can, and watch out for ESD as well...
Jay

Since you mention this, has anyone had any problems with ESD and the open cans?  I have heard many warnings about ESD with the Blu-Rays (I suspect it may be the one of the biggest reasons for un-explained failures of those), but I haven't heard/read many similar things for the open can.  I would expect it to be extremely sensitive to ESD if handled incorrectly since the die is exposed to the air.  Has there been any sign of this?  Do you wear a wrist strap or use an anti-static mat when using the open cans?[/quote]

Honestly, I have not worn my wrist strap yet. I just got it! I have a brass light on my work desk, that I must remember to touch. I also touch my tools to it. So far, I have not had any problems with ESD, I have made plenty of other type of mistakes though. I am sure that the open can diodes are much more 'sturdy' that the blu-ray diodes though. You can tell just by looking at the size difference in the little 'hair' wires at the die...
Jay

 

[laser_freak]

Re: F.S. ***MXDL Custom Machined Heatsinks***

Hey Jay, I am thinking about using a potentiometer in my red open can laser. Any suggestions? Should I keep the 3ohm resistor if I use the pot?

 

[amkdeath]

Re: F.S. ***MXDL Custom Machined Heatsinks***

Hey Jay, I am thinking about using a potentiometer in my red open can laser. Any suggestions? Should I keep the 3ohm resistor if I use the pot?

yes

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

Hey Jay, I am thinking about using a potentiometer in my red open can laser.  Any suggestions?  Should I keep the 3ohm resistor if I use the pot?

There are a couple of things to think about. I used a pot only, in my blu-ray driver, but that was very low current. Using a resistor with a pot, is good. Because it puts a 'ceiling' on the amount of current that can be adjusted. But the main consideration here, would be room inside. For this MXDL build with one of my heatsinks, it is kind of crowded in there. And at current up to 400mA's, your pot would need to be at least 1/2 watt. So yes, a pot would be nice, if you could fit it...
Jay

 

[robjdixon]

Re: F.S. ***MXDL Custom Machined Heatsinks***

what do you mean by discharging the cap?

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

what do you mean by discharging the cap?

If not connected to a load, the capacitor will hold a charge. If you don't discharge it by shorting the wires together, it will fry your LD when you connect it...
Jay

 

[robjdixon]

Re: F.S. ***MXDL Custom Machined Heatsinks***

so i basically have to touch the wires together ?
Are these the wires that would go to the laser diode?

 

[amkdeath]

Re: F.S. ***MXDL Custom Machined Heatsinks***

so i basically have to touch the wires together ?
Are these the wires that would go to the laser diode?

yes


well, just to add, my 3 AAA MXDL has been on back order for a while, with an expected ETA of 3/14/08 (tomorrow)

we will have to see. the rest of that order has shipped.

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

so i basically have to touch the wires together ?
Are these the wires that would go to the laser diode?

Yes, as amk said. But just to add a little more. If you put the silicon diode and cap at your LD, then this is not going to be something for you to worry about. Unless your cap took a charge somehow. Also, just touching the wires together quickly, may not be enough. Hold the wires together for a few seconds...
Jay

 

[laser_freak]

Re: F.S. ***MXDL Custom Machined Heatsinks***

Hey Jay, I got my heatsink today! It looks great! I am AMAZED by the quality! As soon as I get my laser diode tomorrow, I will post some pics of it! I might also be able to take some temperature readings of the aixiz housing with, and without the heatsink to see specifically how well it works. If I do measure the temperature, I will post it here.

PS: I've decided not to use a pot. I just realized how cramped everything is! Maybe I'll make the heatsink a little bit shorter in order to be able to fit it.

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

Hey Jay, I got my heatsink today!  It looks great!    I am AMAZED by the quality! As soon as I get my laser diode tomorrow, I will post some pics of it!  I might also be able to take some temperature readings of the aixiz housing with, and without the heatsink to see specifically how well it works.  If I do measure the temperature, I will post it here.

PS:  I've decided not to use a pot.  I just realized how cramped everything is!  Maybe I'll make the heatsink a little bit shorter in order to be able to fit it.

Thanks for letting me know you got it. Glad to hear you like it! Looking forward to seeing pictures of your build...
Jay

 

[robjdixon]

Re: F.S. ***MXDL Custom Machined Heatsinks***

i recieved my hestsink today. The quality looks great, but the aixix module is quite loose. Is that right? Also, where did you get the set Screws(?) that go on the front of the heatsink. I thought this came with them.

Thanks again.

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

i recieved my hestsink today. The quality looks great, but the aixix module is quite loose. Is that right? Also, where did you get the set Screws(?) that go on the front of the heatsink. I thought this came with them.

Thanks again.

Are you sure the set screw is missing? The set screw is on the side, not the front. It is highly unlikely that it is missing. I always put the set screws in place immediately after threading the hole. If it somehow got lost, I can send you a set screw. You will need a 1.5mm Allen wrench. About the looseness, yes it will be a little loose. But when the set screw is in place, more than half of the module is contacting the heatsink, as well as the set screw itself...
Jay

 

[robjdixon]

Re: F.S. ***MXDL Custom Machined Heatsinks***

sorry, i got confised. where do you get a retaining thing that goes on the front?

 

[jayrob]

Re: F.S. ***MXDL Custom Machined Heatsinks***

sorry, i got confised. where do you get a retaining thing that goes on the front?

Sounds like the set screw is there....that's good. This last question tells me that you are not quite understanding the use of this heatsink. It is designed specifically for this model MXDL:
http://www.dealextreme.com/details.dx/sku.4171
I did explain this on the first post of this thread. Sorry if there was any confusion, but the heatsink is only for that MXDL host. This is the one that DDL first showed in his 'DIY Laser Torch' thread:
http://www.laserpointerforums.com/forums/YaBB.pl?num=1186966870
We have taken his build, to new levels with the open can diodes at higher current, which require more heatsinking...
Jay

 

[robjdixon]

Re: F.S. ***MXDL Custom Machined Heatsinks***

On the mxdl mod pictures that i have seen, on the front of the torch is a metal object that looks like it holds the aixiz module in place in the heatsink. Is the part of the aixiz module, bacause there is something that looks like it on my aixiz module, but it is plastic. If it isn't from an aixiz module, where can i get one?