Old 02-10-2014, 09:34 PM #1
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Old 02-10-2014, 10:01 PM #2
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Looking good mate!

Nice job on the DIY PCB
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Old 02-10-2014, 10:02 PM #3
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Frickin sweet! How much did the whole thing cost you? Looks great as well.
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Old 02-10-2014, 10:15 PM #4
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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Looking good mate!

Nice job on the DIY PCB
THX ARG!

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Frickin sweet! How much did the whole thing cost you? Looks great as well.
THX crazyspaz!
1x Circuit
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cca 100 €
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Old 02-10-2014, 10:31 PM #5
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Not bad price. I know you can get a Radiant Electronics meter for 100USD (~40USD less than yours), but honestly, I would rather build one myself. Its just cool!
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Old 02-10-2014, 10:34 PM #6
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Really cool. How did you make that circuit board?
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Old 02-10-2014, 10:42 PM #7
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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Really cool. How did you make that circuit board?
THX and here is making PCB boards with FeCl :
http://www.youtube.com/watch?v=bk6WJpGyc4I

Last edited by Kalmito; 02-10-2014 at 10:44 PM.
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Old 02-11-2014, 03:33 PM #8
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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THX ARG!



THX crazyspaz!
1x Circuit
1x display
1x switch
2x DC connector (male, female)
2x TEC
2x Headsink
1x Datalogger
1x project box

cca 100 €
This is quite a lot but still worth it. Great work on this.

In general you can build it for less than $50. Mine was around $30 but I had some parts already around like a CPU heatsink. But well mine is also without datalogging.

Last edited by honeyx; 02-11-2014 at 03:35 PM.
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Old 02-11-2014, 04:01 PM #9
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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this is quite a lot but still worth it. Great work on this.

In general you can build it for less than $50. Mine was around $30 but i had some parts already around like a cpu heatsink.
thx!
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Old 02-11-2014, 04:05 PM #10
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Very nice DIY LPM!
+1

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Old 02-11-2014, 04:18 PM #11
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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Very nice DIY LPM!
+1

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Old 02-11-2014, 06:08 PM #12
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

I just wounder how you calibrated it. What did you use for calibration?
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Old 02-11-2014, 06:15 PM #13
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I just wounder how you calibrated it. What did you use for calibration?
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Old 02-11-2014, 09:19 PM #14
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

Hm, unless you got them metered elsewhere with a calibrated LPM the assumed power isnīt a good value to calibrate a DIY LPM. 1.6A in doesnīt mean you get 1.6W out. The output can be somwhere between 900mW and at best 1.6W. All depending to the efficiency of each diode, the optics and your batteries quality.

You better build a calibration tool like I did or get your lasers metered with a calibrated LPM by using a lab powersupply as the power source while they get metered.
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Old 02-11-2014, 09:26 PM #15
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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Hm, unless you got them metered elsewhere with a calibrated LPM the assumed power isnīt a good value to calibrate a DIY LPM. 1.6A in doesnīt mean you get 1.6W out. The output can be somwhere between 900mW and at best 1.6W. All depending to the efficiency of each diode, the optics and your batteries quality.

You better build a calibration tool like I did or get your lasers metered with a calibrated LPM by using a lab powersupply as the power source while they get metered.
How to prepare calibration tool?
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Old 02-12-2014, 04:51 AM #16
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Default Re: [Pic Heavy] My DIY LPM by Kalmito

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How to prepare calibration tool?
You need a small and thin aluminum plate that fits on the TEC. 10x10 Ohm SMD resistors and for example a constant current source like a LM317. You solder the SMD resistors to an "S" while making sure the buttom of this construct is totally flat and glue it on the aluminum plate by also using some thermal paste for better heat transfer. Then of course some leads going to the constant current source. On top of the plate with the resistors you glue some sytyro foam as an heat isulator so the entire heat will be directed to the TEC.

Now when you set the constant current source to 50mA you will get 250mW. At 100mA you will get 1W and at 200mA this will produce 4W of heat.

This is simple U=R*I and P=U*I calculation.

While calibrating also use some thermal paste between the aluminum plate and the TEC and apply some preasure to it for more accurate results.

When calibrating up to 1W you need a powersource with something more than 12V output and for 4W you need more than 22,5V.

Iīve calibrated mine this way and then measured the output with some lasers that got metered before with a laserbee.
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