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Old 11-17-2010, 11:28 PM   #1
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Exclamation Help with 405nm PHR-803T *PICS*

I built a laser driver with a lm317 voltage regulator and 10ohm resistor so it should put out about 125ma. im also using a 1n4001 diode and a 16v capaciter. I built it from instructions here.
Laser driver - It can be done
the laser was working but could barely smoke black plastic when focused and now it barely shows up. Can somebody please help me out this is my first laser build. Im using two 3.7v li-ion rechargabe batteries. Ill post pics later








Last edited by Dunerdude69; 11-17-2010 at 11:39 PM.
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Old 11-18-2010, 01:34 AM   #2
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Default Re: Help with 405nm PHR-803T *PICS*

Your build looks good to me. I just built a 6x BR and am running into the same issue. My 445 blue will punch through the piece of plastic almost instantly (it's ~1.2W) where the 6x is about 110mW and took a good 30 seconds. I'm wondering if the acrylic lens is the problem.
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Old 11-18-2010, 02:31 AM   #3
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Default Re: Help with 405nm PHR-803T *PICS*

it has gotton dimmer since i first built it about a week ago and i have recharged the batteries
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Old 11-18-2010, 02:58 AM   #4
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Default Re: Help with 405nm PHR-803T *PICS*

Look at all those hobby parts!!! I work at a hobby store....lets see. Traxxas sticker and micro deans connectors :P

Did you test the output current of the driver?
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Old 11-18-2010, 05:04 AM   #5
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Default Re: Help with 405nm PHR-803T *PICS*

Ok it's not the acrylic lens. I was messing with mine and it'll ignites matches in under a second and punch through my test plastic in about 5 now. I am using a different diode but for me the trick was to set the focus so at about 10 feet the dot was probably 3-4" which made the "sweet spot" of the beam about 3 feet in front of the lens. Obviously it'll be different for each laser but I hope that helps!

Edit: If it's getting dimmer even after a recharge that sounds like the diode may be damaged unfortunately. I would test the driver output with a test load to make sure it's operating correctly. If it is make sure you don't have any shorts especially at the diode where it's easy to bridge pin to pin or pin to case.

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Old 11-18-2010, 05:26 AM   #6
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Default Re: Help with 405nm PHR-803T *PICS*

judging by your pix and by your description, i would say your phr is working perfectly. it is a low powered laser diode. you are probably less than 100mw. you can't compare it to the new 1watters that are out.


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Old 11-18-2010, 10:34 PM   #7
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Default Re: Help with 405nm PHR-803T *PICS*

since this diode might be dieing what is a good diode to burn stuff at a low price color doesnt matter
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Old 11-18-2010, 11:59 PM   #8
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Default Re: Help with 405nm PHR-803T *PICS*

How long did you keep it on for? I remember my phr's got hot after about a minute at 125ma. Pretty much any laser over 120ma is going to need a heatsink of some sort. The 6x blu diodes are nice and not to expensive. LPC's are fun reds also and are very cheap. Morgan has a thread about a great full kit for lpc's from OdicForce.
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Old 11-19-2010, 12:40 AM   #9
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Default Re: Help with 405nm PHR-803T *PICS*

i would recommend an sfaw 6x 405nm. there are like 10 bucks
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Old 11-19-2010, 01:37 AM   #10
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Default Re: Help with 405nm PHR-803T *PICS*

Quote:
Originally Posted by chipdouglas View Post
i would recommend an sfaw 6x 405nm. there are like 10 bucks
I love this sled, there is also a LCC Red which can reach 250mW!! It's a 2fur!!
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Old 11-22-2010, 03:29 AM   #11
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Default Re: Help with 405nm PHR-803T *PICS*

does anybody have links for the diodes
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Old 11-22-2010, 06:31 PM   #12
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Default Re: Help with 405nm PHR-803T *PICS*

i don't have links but go to the b/s/t section and look around a bit. it is a pretty common sled. also you might want to send member scopeguy20 a pm.

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Old 11-23-2010, 03:08 AM   #13
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Default Re: Help with 405nm PHR-803T *PICS*

Quick question. Did you remember to short out the cap before attaching the diode? It sounds like your diode may have taken a power spike. One of the 635 reds I bought took a spike from a short and barely lases now.

I've bought a bunch of diodes 4x635, 2 PHR sleds, 1LPC 815 sled, a pre extracted 6x AF-SW210, and some other stuff from Modwerx Shop. They're a good company to buy from IME. If you've never extracted a diode from a sled check out the various videos on extracting diodes. The PHR is simple if you have 2 pairs of pliers. The LPC requires a file or fine tooth metal hand saw and a bit of intestinal fortitude since it's an open can diode. I personally wouldn't power an LPC with a LM317 based driver though. From what I recall reading extracting the SF-AW210 from its heatsink can be a chore so I paid the extra couple bucks to get one that was all ready to be pressed.
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Old 11-23-2010, 03:26 PM   #14
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Default Re: Help with 405nm PHR-803T *PICS*

i'm going to quote myself here. it seems that op has not read it. LoL.



Quote:
Originally Posted by chipdouglas View Post
judging by your pix and by your description, i would say your phr is working perfectly. it is a low powered laser diode. you are probably less than 100mw. you can't compare it to the new 1watters that are out.


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Old 11-24-2010, 05:04 AM   #15
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Default Re: Help with 405nm PHR-803T *PICS*

thanks for the help but since the pics it has been dimmer and i have not gottan it that hot
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