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ArcticMyst Security by Avery

laser pen host contact points help

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Mar 5, 2012
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hi. i am going to buy these items eBay - The UK's Online Marketplace
eBay - The UK's Online Marketplace

now i contacted the seller, who is selling both items, and he said i would have to solder a wire from the + on the driver to the host, but that is impossible, becuase the host is very thin and i understand that the negative charge comes into contact with the spring but if the positive charge goes through/around the host then how does it reach the drivers + thingy becuase you would have to get a wire, splice both ends, solder one to the + on the driver and the other above the driver on the host, but inside a very thin metal that is impossible without damaging you host.

i hope you understand what i mean.
any help much appreciated
 





Joined
Jan 27, 2012
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I don't really understand what you mean, but in order to build a pen style host you just have to place the button in, and then line up the on-board switch with the button, and push it in.

Somebody please correct me if I am wrong.
 
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i mean in simple words how does the postive charge get to the driver becuase i think it goes through the metal layers in the host but then from there how does it get to the + on the driver becuase the spring brings the negative charge from the batteries to the driver, so there must obviously be a postive charge link.
 
Joined
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i mean in simple words how does the postive charge get to the driver becuase i think it goes through the metal layers in the host but then from there how does it get to the + on the driver becuase the spring brings the negative charge from the batteries to the driver, so there must obviously be a postive charge link.

Oh right, sorry, but I am new as well so I don't understand this either.

I hope somebody else can help you!
 
Joined
Dec 11, 2011
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If it is for a case positive build (determined by diode mostly) then the driver gets the positive contact through the diode's case pin, which gets fed through the diode's case, which is fed through the diode mount and heatsink, which is fed through the host shell.
 
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so say the aixiz module thing, that would get the postive charge, and it would go into the diode pin that isnt used, which is attached to the circuit, and then it travels to the positive patch on the circuit?
 
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There isn't enough information on the driver or diode used in that module to determine the polarity other than the fact that the spring is negative. If it uses a case negative diode it cannot be used in that host, which is case positive. If it uses a case neutral (insulated) diode then it will not work in the host unless you add a positive current path (this would be connecting the unused case pin to the anode pin).

There is a reason we generally don't buy parts from eBay. Why are you looking there solely? Most of what is there is cheap chinese crap that has no info and no guarantees.

Please don't double post replies, just edit and add in more info to your last post.
 
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ok sorry. so where should i go to build a cheap pen host laser of about 50mw
 
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No problem, if no one ever told you not to double post how would you know, right? =)

Requiring it to fit a pen build makes it difficult. However, when it comes to pens you can usually buy completed pre-built ones which work well for much less than parts would cost you to do yourself and are almost always overspec. This is the opposite of torch style hosts (I gather you're in the UK, we call torches "flashlights" here in the states) which are cheaper to DIY and usually come underspec when sold by companies. The problem lies then with getting any complete laser through parcelforce/customs. Finding a 405nm module from a quality source so you can DIY a pen build isn't easy.

Have you considered using a torch style host instead? It is much simpler to get the right parts and be assured it will all work together that way. Buy from members here or the commonly recommended shops and you'll get the best parts and service your money can buy. eBay is mostly inflated prices attached to underperforming low quality mass-produced crap, when it comes to cheap diode lasers.
 
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yes i have considered the torch/ flashlight but i have never been able to understand the polaritys and there are too many parts in the flashlight, heatsink etc. i have ordered a 5mw green laser pen from amazon, when it comes i will take out the 5mw module, then can i just swap it with the 50mw voilet one? if the polaritys are the other way round cant i just put the batteries in the other way. would this work?
thanks for your help
 
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The negative end of the battery usually won't make contact with the cap on the pen, but you can use a bit of wadded up aluminium foil in that case. Remember, not all drivers have reverse polarity protection, so if it is the other way around and you try it, it may fry the entire module.

Yes, there are more parts with a torch build, but they can be made for any polarity on demand (by you reversing two wires or reversing the battery(s)). Basically the heatsink is what the module fits in to, and there are host parts that hold the heatsink in place, it's simple when it is infront of you. The "pill" is a section that screws in above the battery compartment which is often used to hold the driver, when the driver doesn't have a spring. A contact board is used between the pill and the battery compartment, this is just a board that has a spring on it that you connect your driver's input leads to. On builds where the driver has a spring and is connected to the diode, you just leave the pill out, so it's only a matter of putting the batteries in correcy and setting the module in place in the heatsink.

Btw, there is a UK based laser shop that is reputable, I can't remember their name but perhaps one of our other members will.
 
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god this is so much more complicated than i thought. all this polarity and reverse stuff. i thought if i just bought a cheap 5mw and replaced modules, it would work, but apperantly not. i think i might just stick to building a labby in a box first, as all the parts arent stuffed into little tiny hosts and it will be good soldering practice.
 

Stix62

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daawood123... Is is just a 50mW violet pointer you're after?, and are assuming there is nothing above 5mW on ebay?
 
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yes just a 50mw for now, later will move onto 1w blue after i understand bout the contact points etc. and ebay are not legally allowed to sell a complete laser above 5mw, but they can sell modules, and 50mw are good priced.
 

Stix62

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yes just a 50mw for now, later will move onto 1w blue after i understand bout the contact points etc. and ebay are not legally allowed to sell a complete laser above 5mw, but they can sell modules, and 50mw are good priced.

The thing with ebay pointers is a lot of them will be way over 5mW despite what the listing says. You could buy one of those 5mW and it might be closer to 100mW than it is to 5mW ;-)

The reason I asked was if you were just after a violet pointer @ 50mW (or above), I was going to say why not try Swimminsurfer (link in my signature ' Swims' Blu-ray - 70mW' )
That said, it looks like he's out of stock at the moment.
I've got one of swims blu-rays, LPM's @ 70mW.
 




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