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Do green lasers have to be case positive?

MISTERWILLING

MISTERWILLING

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I have a green module from o-like, and I was wondering if is HAS to be case positive. I know reds have to be case negative, and blu-rays can be either depending on which pin you solder to the case pin. So I was wondering if it is possible to make a green laser case neutral just by de-soldering from the case pin like a blu-ray. This would make my 7-color build easier, if not i will make sure and isolate it from the red diode case. I am trying to get all my lasers mounted on a plate that would act as a heatsink and help with alignment.
 





jayrob

jayrob

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I believe you should be ok as long as you have a separate power supply for the green...
Jay
 
HIMNL9

HIMNL9

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You have only one possibility to build a case negative green, and is insulating completely the body of the module from the case, and ofcourse changing the module disposition for not use the already present spring for negative contact ..... but, first, better ask yourself "do this worth the effort ?" ;)
 
C

changeup

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Is that the main reason why there's so many builds for red and blue, but not green....? more difficult....?

Mike
 
C

changeup

Guest
Styro,
what is the main problem with the GREEN lasers as compared to the other colors....?(really) Are they more difficult to build? I was thinking of getting a RCKSTR driver for 13 bucks and a 405nm PHR-803T Blu Ray Diode in Aixiz Laser Module Housing from HighTechDeals. What more ids htere that I need to buy?
Thanks.

Mike
 
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c4r0

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HIMNL9 said:
You have only one possibility to build a case negative green, and is insulating completely the body of the module from the case, and ofcourse changing the module disposition for not use the already present spring for negative contact ..... but, first, better ask yourself "do this worth the effort ?" ;)
Click to expand...

You can also make different driver for the green laser, one that have the ground on positive power line (you know, power is then for example GND and -12V instead +12 and GND). Then you have common ground and don't need any insulation. But IMO its much easier to just insulate the green or blue/red from the heatsink. I built this kind of laser about 3 weeks ago and I insulated red and blue lasers, see the pics.
 

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HIMNL9

HIMNL9

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^ yes, if you build a lab style unit (also if current regulators that work good on neg line are a little bit more difficult) ..... but i think they was speaking mainly about portable units (pointers).
 
Benm

Benm

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You could fairly easily make a switchmode driver that has a negative output voltage, allowing you to mount both the negative battery terminal and the module to the housing.

If the green is a module with current regulation built in, you only need to provide a negative stable voltage. A fairly standard switchmode regulator like MC34063 will do a fine job here, and can be powered from 2 lithium batteries to create a negative 3 or 4 volts at very good efficiency.
 
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ElektroFreak

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changeup said:
:D

Thanks, Styro
Click to expand...

Any time, bud.. If you're looking for a response only from a specific member, that's why God made PMs.. This is what we like to call a "forum thread". In a forum thread, the general public will post or answer questions..
 
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HIMNL9

HIMNL9

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@ Benm: no, i mean, about already done pointers, or ready-to-use modules, that for easyness are industrially all made with case positive ;)

Ofcourse, if you build your own modules, you can made them any way you want :)
 
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