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Old 08-12-2012, 07:01 PM #1
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Default DIY LPM "Kit" $40... Now with Calibration!

EDIT EDIT:
Currently I'm too busy with school to do this,
At some point in the future I will start selling LPM's






NEW OFFER:
Anyone who buys this kit from me can mail me there finished LPM un-calibrated,
and I will calibrate it with a 1.5W 445nm blue laser at 25c against my ophir head
Free of charge, Simply include return postage
***


Price is $40 for the kit + Shipping

--------------------------------------

These are intended for people looking to build a DIY LPM,
The Kit handles the Electronics aspect,
and leaves the Optics to you.

What IS included:


What is needed:
  • Tec/Heatsink w/ coating, and Calibration.
  • Battery and Charging circuitry (If you want it to be portable)


The battery shouldn't be too hard to figure out for most people who have made a laser.
The boosting psu in these is quite flexable and will run on anywhere from 3V to 9V.
A single Lithium-ion works fine

-----------------------------------

As for the TEC I have a few posible recomendations,

1) Buy a tec, Buy a heatsink, Thermal Epoxy them together.
Coat the Tec w/ either flat black spray paint, or flat black grill paint.
Calibrate against an LPM or a known stable Laser


OR

2) Buy a used head on ebay like this:
++ SCIENTECH MODEL # 380101 LASER POWER METER HEAD | eBay
attach it to your LPM and calibrate it against an LPM or a known laser.


------------------------

The max power of your LPM will be dependent or your choice of TEC and coating,
But the Circuitry in this LPM can go up to 5W's

When selecting a tec Generaly speaking
  • The smaller the TEC, the faster you will get a reading
  • The higher the QcMax, The more likely your LPM will be accurate over a greater range.

-------------------------







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Old 08-26-2012, 03:44 PM #2
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Default Re: DIY LPM "Kit" $50

Kit now for sale.
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Old 08-27-2012, 07:23 AM #3
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Default Re: DIY LPM "Kit" $40

So if i read correct this can be used with a ophir 20-C-1-Y head?

But the ophir head is precalibrated? And uses 2x 9V?
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Last edited by offroadfreak8582; 08-27-2012 at 07:28 AM.
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Old 08-27-2012, 09:37 AM #4
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Default Re: DIY LPM "Kit" $40

A DMM is even less expensive...
The cost of an accurate LPM is not in the miscellaneous
electronic parts...


Jerry

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Last edited by lasersbee; 08-27-2012 at 09:49 AM.
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Old 08-27-2012, 01:57 PM #5
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Default Re: DIY LPM "Kit" $40

Quote:
Originally Posted by offroadfreak8582 View Post
So if i read correct this can be used with a ophir 20-C-1-Y head?

But the ophir head is precalibrated? And uses 2x 9V?
Using an ophir is a little tricky, but doable

1) Short out all 3 pins on the main adjust pot, (Permanently w/ solder)
2) Grab a 1.5V battery and a multimeter
3) Measure the Battery with the LPM and the multimeter at the same time
4) Make them the same by adjusting the 1X range pot (Unless it is already the same)
5) Switch the lpm to 10X and make them the same again (Unless it is already the same)

After you have calibrated it like this here is how to hook everything up:



The Chargers could be replaced with 9V batteries,
If you do that I would recommemd powering the LPM with a rechargeable 4.2V battery, because my lpm will drain a 9v faster than the ophir head.

Also if anyone is interested,
this meter would work with a 150C-A-.3-Y or a 150C-A-.1-C/ERB
but would require a different method of cailbrating
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Last edited by justinjja; 08-27-2012 at 02:58 PM.
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Old 08-30-2012, 11:35 PM #6
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

NEW OFFER:
Anyone who buys this kit from me can mail me there finished LPM un-calibrated,
and I will calibrate it with a 1.5W 445nm blue laser at 25c against my ophir head
Free of charge, Simply include return postage.

***Shipping and insurance for this process is the responsibilty of the buyer
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Last edited by justinjja; 08-30-2012 at 11:39 PM.
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Old 08-31-2012, 12:43 AM #7
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Default Re: DIY LPM "Kit" $40... Now with Calibration!



If I didn't have 24/7 access to your LPM's I'd totally buy one :P
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Old 08-31-2012, 02:11 AM #8
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

I'd like to purchase it, PM me your paypal plz
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405nm : PHR-803t in Dorcy Jr. Old Style with Ehgemus heatsink: 102mW
405nm : Bluray in SAIK SA-305 at 745ma: 980mW
445nm : Guidesman Dual E-Drive: 1.6W
650nm : LPC-815 @ 0.45A in Ehgemus Host Easy Build: 293mW

List of 12x 405nm 5.6mm diode builds

Last edited by gillza; 08-31-2012 at 06:58 AM.
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Old 08-31-2012, 11:05 AM #9
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Please PM me with calibrated LPM with TEC included, and shipping to South Africa.
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Old 08-31-2012, 05:30 PM #10
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Quote:
Originally Posted by Humphry View Post
Please PM me with calibrated LPM with TEC included, and shipping to South Africa.
The first Post reads......

----------------------------------
"Anyone who buys this kit from me can mail me there finished LPM un-calibrated,
and I will calibrate it with a 1.5W 445nm blue laser at 25c against my ophir head
Free of charge, Simply include return postage
***

What IS included:


What is
needed:
  • Tec/Heatsink w/ coating, and Calibration.
  • Battery and Charging circuitry (If you want it to be portable)"
----------------------------------

1) You need to buy the kit
2) You need to assemble it
3) you need to supply your own Sensor... Coating and Head
4) you need to send it all back for Calibration
5) you need to pay shipping 3 times


Jerry


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Last edited by lasersbee; 08-31-2012 at 05:33 PM.
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Old 09-08-2012, 04:03 AM #11
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Justin,

The package arrived safely today. Thank you!
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405nm : PHR-803t in Dorcy Jr. Old Style with Ehgemus heatsink: 102mW
405nm : Bluray in SAIK SA-305 at 745ma: 980mW
445nm : Guidesman Dual E-Drive: 1.6W
650nm : LPC-815 @ 0.45A in Ehgemus Host Easy Build: 293mW

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Old 09-11-2012, 04:08 AM #12
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

I would buy it if you listed all the recommended parts to get to 3W. I dont like guess work like "power reading is based on your choice of components"
Just tell us the different components we need to buy to get certain outputs please
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Old 09-11-2012, 04:35 AM #13
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

This is what I got:
Coating:
High Heat 12 oz. Flat Black Automotive Spray Paint-248903 at The Home Depot

TEC:
http://www.digikey.com/scripts/dksea...rds=430801-504
(recommended by MarioMaster)

Heatsink:
513102B02500G Aavid Thermalloy | HS346-ND | DigiKey

Not sure what this combination will get me in terms of Max output, but my plan is to get it calibrated and to get the exact measurements from my lasers. Later I will try and change the combination of TEC/Coating/heatsink to determine the max power I could measure (using the known output from the lasers of-course).
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405nm : Bluray in SAIK SA-305 at 745ma: 980mW
445nm : Guidesman Dual E-Drive: 1.6W
650nm : LPC-815 @ 0.45A in Ehgemus Host Easy Build: 293mW

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Old 09-11-2012, 04:42 AM #14
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Ok awesome. PLEASE report back with your findings, I really want to hear about it because I want to know what combo to use.
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Old 09-17-2012, 02:51 PM #15
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Quick question: would this heatsink be sufficient for a 40mm TEC? Or it is too small? 2pcs 40*40*11MM High Quality Aluminum Heat sink adhesive for ICs LED Or Fan DIY | eBay

And would a 40mm TEC even work well? The qcmax is around 85W, but how long will the reading take to stabilize with such a large surface?
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Old 09-17-2012, 02:56 PM #16
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Default Re: DIY LPM "Kit" $40... Now with Calibration!

Quote:
Originally Posted by The Baron View Post
Ok awesome. PLEASE report back with your findings, I really want to hear about it because I want to know what combo to use.
I have ordered the wrong thermal adhesive and waiting for the correct one. Will assemble everything and send back to justinjja as soon as possible
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My lasers:

405nm : PHR-803t in Dorcy Jr. Old Style with Ehgemus heatsink: 102mW
405nm : Bluray in SAIK SA-305 at 745ma: 980mW
445nm : Guidesman Dual E-Drive: 1.6W
650nm : LPC-815 @ 0.45A in Ehgemus Host Easy Build: 293mW

List of 12x 405nm 5.6mm diode builds
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