Old 11-14-2010, 03:08 AM #1
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Default My 635 red pen with custom DDL driver. (lots o' pics)

About a month ago I posted this thread "http://laserpointerforums.com/f50/do...oes-56874.html" about the first laser I built from scratch on a breadboard. I decided instead of stuffing it in a project box it deserved a better host than that so I ordered one of Jayrob's black pen hosts. Yeah I decided a pen would be a good idea for a first build.

Now before I go on I must take a moment to recognize the diodes that gave themselves for this project.

635 LD1 shined brightly for weeks on end and didn't complain when I forgot to unplug the power and left it running all night and found him happily lasing away 13 hours later. His life was cut short when some unnamed idiot mistook the clips from the battery pack leads for those from the multimeter. Death was thankfully instantaneous.

635 LD2 bravely stepped up to take his place only to be maimed for life after the back of the aixiz module moved during pressing and snapped off his legs. He only lased once but he shown brightly. He did get his final revenge while I was using FlamingPyro's diode extractor when it slipped and his case pin jammed most of the way into my finger. I can't say I blame him.

635 LD3 was next on the firing line and served valiantly until a short turned him into an LED. Another purple heart recipient.




Ok I admit that was cheesy as hell but I couldn't resist. Now on to the build pics.


2010-10-30_06-28-15pm by ltkernelpanic, on Flickr

The parts list:

Jayrob black pen host with switchboard option
5mW 635nm diode and aixiz module from modwerx
"baby" LM317
30 ohm resistor

not pictured are the two 10440 LiIons that power it. The diode wasn't used after all.


2010-11-08_09-01-36pm by ltkernelpanic, on Flickr

First I trimmed one leg of the resistor and soldered it to the top of the adjust leg then soldered the other leg to the bottom of the output leg. I clipped that bit that was jutting towards the input leg later.


2010-11-08_08-59-55pm by ltkernelpanic, on Flickr

It works. One of 635 LD3's final performances.


2010-11-08_09-06-54pm by ltkernelpanic, on Flickr

The switch board option I bought with the kit. Well worth the extra 3 bucks IMO. You can get power from the large pad right in front of the switch or the top two pads in the second row from the right.


2010-11-08_09-24-38pm by ltkernelpanic, on Flickr

Here I soldered what was left of the leg I trimmed off the 30 ohm resistor onto the board and bent it to fit though the opening in the switch holder. I had to redo the tape to only cover the area where the LM317 would sit so the board would silde in the holder.


2010-11-08_09-37-04pm by ltkernelpanic, on Flickr

The driver soldered to the switchboard. I didn't notice the solder blob was that big until i took this pic. I tapped it with the top of my iron a couple times to make a nice smooth joint that I could slide a piece of heat shrink tubing on.


2010-11-08_10-10-29pm by ltkernelpanic, on Flickr

Everything all soldered up.

Unfortunately there was a fatal flaw in my work. The way I soldered and bent the lead going to the driver meant the switch had to sit farther back in the holder so when I put it in the host and tested it a few times the switch jammed from not being pushed down straight. I ended up ordering a new switchboard along with a second pen for a later build. I didn't take any pictures since I only chanced two minor things. When I soldered the lead to the board this time I attached it to the second pad in so when I bent it it was just inside the board allowing it side into the holder properly. I also soldered a longer wire between the driver and diode. Here's a free tip: Never toss the legs from resistors/diodes after trimming them to length. They're great for jumpers or things like this.

All that now said the final product.


2010-11-13_12-13-06am by ltkernelpanic, on Flickr

Now the 64k question is after all that does it work?




2010-11-13_12-13-50am by ltkernelpanic, on Flickr

Yep!


And a crappy beam shot. Time to go hunting on amazon for a cheap fog/smoke machine.


2010-11-13_12-01-33am by ltkernelpanic, on Flickr

The dot looks huge because I was handholding the laser during a 1 second exposure.

I realize I could have bought two prebuilt, smaller 5mW laser pointers for what the four diodes cost me alone but as my AP chem teacher back in highschool said sometimes you have to "Learn for learning sake." which is how I approached this project.

I should also note that the "baby" LM317 i ordered because I didn't think a standard LM317T would fit on my breadboard. I also didn't realize when I ordered them they were limited to outputting 100mA so I just tossed them in my parts bin when I found out that the "normal" sized one fit fine until this project came along where it worked perfectly.

Wow. That was a long post. I apologize for all the pics to those on slower connections but I always found that I learned best from seeing then doing so maybe someday these will help someone else.



Last edited by LtKernelPanic; 11-21-2010 at 06:01 AM. Reason: fixed broken image
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Old 11-14-2010, 06:56 AM #2
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Very nice. I rigged up one with a Rkcstr driver and some goofy switch I scavenged from some other pointer. Nice and bright for a red pointer, and nice for situations when you want to use a brighter pointer but not an overly bright green pointer.
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Old 11-16-2010, 05:38 PM #3
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Nice host I just made a 445 low power pointer with one very similar.
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Old 11-21-2010, 03:45 AM #4
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

I lol'd a few times on that one... "got it's revenge...."
Thanks for the laughs I needed that.
Nice biuld BTW
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Old 11-21-2010, 06:24 AM #5
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Heh. Glad someone got a chuckle out of that. It actually hurt like hell for a minute or two afterwards. I do need to find some other way other than black tape to hold the module in now that I know it works right and I shouldn't have to take it apart. I may use two small dabs of silicon that'd be hidden under the focus ring which could be easily removed if need be. I like the color too. It's not as "red" as the 660nm LPC build I finished Friday but still has a nice color to it.
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Old 11-21-2010, 02:06 PM #6
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Nice build! I did one myself using the 10 mW 635 module from aixiz that comes with an included driver (3v input).

Nice to have an additional wavelength, and something relatively safe to let people play with
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Old 12-01-2010, 04:40 PM #7
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Did you tape aixiz to the front to isolate the diode from the case? Also looks like you have the switch attaching + how did you attach ground to the case solder?
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Old 12-01-2010, 11:03 PM #8
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

No, it's taped because I hadn't permanently attached it to the host yet in case I had to take it apart again. The inside of the host is bare brass so it gets ground from direct contact with the module. I'll eventually attach it permanently with a solder blob or maybe a couple tiny dabs of clear silicon adhesive that'd be hidden by the focus ring. I'm leaning towards the latter incase I ever need to remove the module again. If I do it that way I'll sandwich a thin piece of wire between the host and module to ensure a good connection between the two.

Edit: I should have added that the positive end of the battery goes against the spring not the negative like you normally would. I had to cut the end of the plastic insulation at the end of one of the batteries to get a good contact with the tail cap. I'll take a picture later if you'd like.

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Old 12-01-2010, 11:10 PM #9
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Time for another stupid question but is the case pin on the diode the LD+? I know a lot of the 635nm are and if you touched the case wouldn't that be bad?
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Old 12-01-2010, 11:31 PM #10
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

No, case pin is LD- which is why there's no need to isolate the module in a case negative build. Look at the pin out diagram in this thread.

http://laserpointerforums.com/f51/di...tml#post601959

The pinout is the same as the LPC-815.
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Old 12-01-2010, 11:34 PM #11
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

I am thinking of the DL-6353TL you are using the DL-6353TR
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Old 12-19-2010, 04:38 AM #12
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Were did you get the diode?
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Old 12-19-2010, 04:53 AM #13
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Quote:
Originally Posted by trever22 View Post
Were did you get the diode?
Well you posted in 2 different thread talking about 2 different diodes what diode do you want?
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Old 12-19-2010, 05:01 AM #14
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Quote:
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Well you posted in 2 different thread talking about 2 different diodes what diode do you want?
Both, so i can compare and then decide
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Old 12-19-2010, 05:07 AM #15
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

He says right in the post where he got the diode from.
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Old 12-19-2010, 05:09 AM #16
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Default Re: My 635 red pen with custom DDL driver. (lots o' pics)

Quote:
Originally Posted by Pontiacg5 View Post
He says right in the post where he got the diode from.
oh, sorry must of missed it
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