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Insulation Problems

Mr. Delirium

New member
Joined
Dec 10, 2022
Messages
21
Points
3
The latest project that I've been working on (and my first pen build) has been a ~150mw red laser pointer that uses the Mitsubishi LPC-840 along with an AMC7135 current regulator.

Problem:
Both the negative and positive connections from the batteries must go through the AMC7135 to properly drive the diode
Mitsubishi_LPC-840_650nm.png
As you can see, the diode is case negative. I knew this going into the project and assumed that I could use some kapton tape to insulate the 12mm module from the host. My hosts happened to be the amazing leadlight hosts from Laser66 which happened to be machined to have an ID of exactly 12mm. I wasn't expecting such tight tolerances, but it's definitely a testament to the quality of Laser66 products.

PXL-20230112-045725156.jpg

PXL-20230112-045837539.jpg

This makes it impossible to fit into the host, I have tried sanding this thing down for about an hour now and I don't think it's going to work.
If any of you have tips on how to maybe insulate this a different way, insulate the diode from the module, or recommend some cheap drivers, I'm all ears. Worst case scenario I buy some more pricy drivers. This was supposed to be a very cheap build so I'd like to stray away from that.
All help is appreciated :)

*If you got the notion that I was dissing Laser66 products in any way during this post that was not my intention, I genuinely like their products. Sometimes my thoughts aren't as clear as I would like
 
Last edited:





405nanoMatt

Active member
Joined
Sep 9, 2019
Messages
158
Points
43
Use something tapered as a mandrel and flare out the end you need to put the module in. Needle nose pliers usually get the job done for me.
 
Joined
Oct 6, 2015
Messages
1,366
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I build many of this pen laser's it's tricky to get it in all the way but it's possible see mine video's
i will update some of this video's using mine camera.
 

Mr. Delirium

New member
Joined
Dec 10, 2022
Messages
21
Points
3
I build many of this pen laser's it's tricky to get it in all the way but it's possible see mine video's
i will update some of this video's using mine camera.
beautiful lasers, did you just sand down the interior of the host, or maybe the module?
 

405nanoMatt

Active member
Joined
Sep 9, 2019
Messages
158
Points
43
Neither do I . I do it by hand . Either with a cordless drill with a half inch chuck or a pair of vise grips.Just secure the host and insert whatever makeshift mandrel I have on hand that is the proper size and slowly turn while applying downward pressure.
 





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