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Old 02-07-2012, 11:33 PM   #1
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Default [Pic Heavy] My DIY LPM!

Hey all! So this post will be added to when I can get some pictures and all that

First and foremost, I'd be a fool if I did not thank Jufran88. He helped me so much with this. He sold me 2 boards that he used in his LPM for a very reasonable price and answered all my questions and helped me troubleshoot. He really is a stand-up forum member! Check out his stuff, its really great!

A note on his boards. He had them made for use with smd components, but I used some through hole parts soldered to the pads seeing as that's all I had. Works like a charm

Here are some photos of the build!



As you can see the mounting hole was cut a little too long vertically in the upper left corner of the panel meter. My dad got a little carried away with the reciprocating saw...



I like this switch. It's sturdy! But it has a big 3/4" mounting hole.



Here's the audio jack and plug used to connect the TEC to the amp



Theres the TEC. I secured the wires with some epoxy and thermally adhered the peltier to the big ol' heatsink.



There's the meter up and running!



This photo is just because I wanted to sneak a beamshot in here The meter was still going up, but the fog kinda hinders that. Anyway, I like the photo so its in here

Here are some videos of it!

Here's the LPM Turning On. I had just switched rooms so it isn't zeroed properly until the test. But it does zero!



Here's a test with it using my 428mA LPC-815 Aurora C6. I cut off the end a little short since it goes to 256 and stays there




You may be asking yourself/me how I can know if the measurements are right. Valid question. A while back I got some lasers from Lazerer and got the Power Certificate. I used those for calibration under the same circumstances that they were tested under.
In the end, both lasers come in at their marks consistently!
Also, all lasers I have tested that I have built all come in at around what their "mA to mW" show for each diode. So I'd say I got it pretty good. not to toot my own horn

The display is not as deep green as the video shows, but it's still nice. I kinda like its simple color. It's more of a yellow-green color.

Instead of opting for the $30 custom 8x8mm TEC Peltier Jufran used, I found an 12x12mm TEC with less couples on eBay for less than $7! It works just the same, but the final reading takes a little bit longer to achieve. The seller also has 8x8mm ones, but they have a low coupling count.

TEC. It's not the same one I have, I can't find that. But this one is 15mm x 15mm
http://www.ebay.com/itm/DC-2V-2-8W-T...ht_2212wt_1141

Voltmeter
http://www.ebay.com/itm/Super-Mini-E...item2a1517830f

This whole build cost me about $40 in total parts. Definitely happy with the quality for the money. It'll satisfy my measurements to a "good idea" until I buy a professional LPM.

I might build another one at some point with the other board and spare parts I have. But for now I love this thing The only thing I'd change would be the TEC and Voltmeter display color

for the help, Jufran88!

Lemme know what you think!

Last edited by Fretwrecker94; 02-10-2012 at 09:16 PM. Reason: adding photos and links
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Old 02-08-2012, 12:03 AM   #2
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Default Re: My DIY LPM!

Well done! I'm glad it all worked out. That's a nice huge heat sink you mounted the TEC too.
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Old 02-08-2012, 12:12 AM   #3
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Default Re: My DIY LPM!

Quote:
Originally Posted by Jufran88 View Post
Well done! I'm glad it all worked out. That's a nice huge heat sink you mounted the TEC too.
Haha thanks, I just had it laying around and figured it'd work just fine
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Old 02-08-2012, 12:21 AM   #4
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Default Re: My DIY LPM!

Nice job on your DIY LPM...

Is your circuit using a dual rail supply or a
single rail supply like the $50 DIY LPM circuit
by MarioMaster...


Jerry
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Old 02-08-2012, 12:39 AM   #5
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Default Re: My DIY LPM!

well done@!
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Old 02-08-2012, 12:52 AM   #6
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Default Re: My DIY LPM!

Quote:
Originally Posted by lasersbee View Post
Nice job on your DIY LPM...

Is your circuit using a dual rail supply or a
single rail supply like the $50 DIY LPM circuit
by MarioMaster...


Jerry
Well I run it off of a single 9V battery so I guess that makes it a single rail! Unless I'm sadly, sadly, sadly mistaken

Quote:
Originally Posted by Joe Mo View Post
well done@!
Thanks man!
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Old 02-08-2012, 02:46 PM   #7
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Default Re: My DIY LPM!

Quote:
Originally Posted by Fretwrecker94 View Post
Well I run it off of a single 9V battery so I guess that makes it a single rail! Unless I'm sadly, sadly, sadly mistaken



Thanks man!
Yeah... that would be a single rail like the $50 DIY LPM
by MarioMaster.
The only problem is that after doing a few High Power
Laser tests and the Heatsink starts to warm up you
won't be able to zero the meter anymore...


Jerry
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Last edited by lasersbee; 02-08-2012 at 02:47 PM. Reason: Spelling errors
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Old 02-08-2012, 03:57 PM   #8
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Default Re: My DIY LPM!

Quote:
Originally Posted by lasersbee View Post
Yeah... that would be a single rail like the $50 DIY LPM
by MarioMaster.
The only problem is that after doing a few High Power
Laser tests and the Heatsink starts to warm up you
won't be able to zero the meter anymore...


Jerry
Yeah I realize it does heat up. But I give it breaks after a few. And my highest power laser is ~260mW so I imagine it won't be too big of an issue.
It will suffice until I can afford a real one
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Old 02-08-2012, 04:05 PM   #9
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Default Re: My DIY LPM!

Nice job! Looks awesome.
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Old 02-08-2012, 05:02 PM   #10
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Default Re: My DIY LPM!

GREAT JOB! I might start looking into a building one.
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Old 02-08-2012, 05:32 PM   #11
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Default Re: My DIY LPM!

Quote:
Originally Posted by Fretwrecker94 View Post
Yeah I realize it does heat up. But I give it breaks after a few. And my highest power laser is ~260mW so I imagine it won't be too big of an issue.
It will suffice until I can afford a real one
At those powers you should not have that Zeroing problem...
I was referring to >1Watt Lasers..

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Last edited by lasersbee; 02-08-2012 at 06:47 PM. Reason: Spelling errors
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Old 02-08-2012, 05:53 PM   #12
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Default Re: My DIY LPM!

I love that heatsink, I have the same one. It looks very cool with the copper "cooling pipes"
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Old 02-08-2012, 06:40 PM   #13
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Default Re: My DIY LPM!

VERY nicely done on such a low budget build, looks like it works great; Congrats!
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Old 02-08-2012, 09:20 PM   #14
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Default Re: My DIY LPM!

Quote:
Originally Posted by Ghostchrome View Post
Nice job! Looks awesome.
Thanks, man

Quote:
Originally Posted by mikesnap99 View Post
GREAT JOB! I might start looking into a building one.
I'd say go for it. It isn't really that bad! calibrating only takes a little while if you have a known output laser!

Quote:
Originally Posted by lasersbee View Post
At those powers you should not have that Zeroing problem...
I was referring to >1Watt Lasers..

Jerry
Yeah I'm not going to be dipping my toes into +500mW for a little while. Just a little too powerful for my taste. Plus multimode diodes don't really appeal to me. I may jump on a 12x 405 though!

Quote:
Originally Posted by Joe Mo View Post
I love that heatsink, I have the same one. It looks very cool with the copper "cooling pipes"
Yeah my dad had it laying around. He's a computer builder as a hobbyist and didnt need it. I had to clip off and file down some of the tubes on one side to get it to stand upright. But I'll explain that when I update the OP with some pictures later on

Quote:
Originally Posted by electron View Post
VERY nicely done on such a low budget build, looks like it works great; Congrats!
Thanks man! I really love it. I enjoy taking time to make clean builds just makes it that much more satisfying!
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Old 02-10-2012, 10:00 AM   #15
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Default Re: My DIY LPM!

Very nice build! You happen to have a few photo's of the unit?

The calibration accuracy depends on the stability of the laser, but it is definately a valid way to do a calibration.
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Old 02-10-2012, 10:18 AM   #16
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Default Re: My DIY LPM!

Quote:
Originally Posted by Bluefan View Post
Very nice build! You happen to have a few photo's of the unit?

The calibration accuracy depends on the stability of the laser, but it is definately a valid way to do a calibration.
I'll be takin some photos of it tonight! So keep on the l'll update the OP with them.
Yeah, obviously it isn't 100% accurate, but I can like with 95% ish. It seems to give a good idea of power
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