Old 06-05-2012, 07:20 AM #1
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Default Gold Plated 445nm 800mW Pen Build

I purchased this host here. Gold Pen host kit [GLDPEN] - $24.99 : Cajunlasers Store

I used a copper module with an M140 diode. The diode is pressed into the module and the module presses into the top of the laser.
The driver is the BlitzBuck V2 1.17A
The laser is powered by 2 10440 and is case positive
I cut the threading off of front cap piece as it is not needed and now use that piece as the lens holder/focus adapter. It also serves to cut the sides of the lasers beam somewhat and the spot I am left with is MUCH more pleasant to look at. It appears now to have way better divergence. I will measure this soon.
I am using a 3 element glass lens and getting around 850mW.
Because this laser does get warm rather quickly do to the lack of heatsinking it is only to be used 15-20 seconds at a time.
I love the gold plated look to it. This is one of my favorite builds ever.
Here are some photos of my new beauty.











The rivet in the power curve is where I accidentally released the power button.
Thanks for looking.


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Old 06-05-2012, 07:28 AM #2
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Default Re: Gold Plated 445nm 800mW Pen Build

Drill the front cup to get's out the beam. You're blocking the 20%.
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Old 06-05-2012, 07:32 AM #3
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Default Re: Gold Plated 445nm 800mW Pen Build

I prefer the nice spot. It looks GREAT this way.
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Old 06-05-2012, 09:15 AM #4
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Default Re: Gold Plated 445nm 800mW Pen Build

Very classy. How quickly does it drain those tiny batteries?
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Old 06-05-2012, 10:43 AM #5
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Default Re: Gold Plated 445nm 800mW Pen Build

Not sure, they have been going strong so far with at least 10 minutes on the clock. It uses 2 10440 with 600 mAh each and the driver is a buck style that puts out 1.17A. Anyone care to do the calculation?
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Old 06-05-2012, 11:01 AM #6
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Default Re: Gold Plated 445nm 800mW Pen Build

Check the current draw by placing your DMM on the 10A setting and putting it in place of the tailcap.

Then take the capacity of your batteries and divide it by its draw current... for example

Draw current 2000mA
1000mAh battery

1000/2000 = 0.5 hours
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Old 06-05-2012, 12:29 PM #7
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Default Re: Gold Plated 445nm 800mW Pen Build

This is a Great Laser Luke.

I Love the Gold Look.!

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Old 06-05-2012, 02:43 PM #8
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Default Re: Gold Plated 445nm 800mW Pen Build

That is a nice little powerful blue laser !
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Old 06-05-2012, 03:40 PM #9
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Default Re: Gold Plated 445nm 800mW Pen Build

Quote:
Originally Posted by yobresal View Post
Not sure, they have been going strong so far with at least 10 minutes on the clock. It uses 2 10440 with 600 mAh each and the driver is a buck style that puts out 1.17A. Anyone care to do the calculation?
Few information bits missing.

Under assumtion that the diode needs aproximately 4.6 Volts at 1.1 Amps,
Driver is outputting ~5Watts of electrical current.

Under assumtion it's efficiency is around 80%,
It is drawing 6 Watts (1W of heat on driver),

If we assume voltage drop of batteries under load to 4V from 4.2 V when full,
It means that when batteries are 100% charge,

Laser will draw 0.75 Amperes from two batteries equalling 8 Volts.

Not sure what brand of 10440 you use, but let's assume they are top-of-the line stuff at like 500mAh capacity,

They would last aproximately 0.6 hours, or 40 minutes.

Now as the voltage of the batteries drop, current draw increases, and if they are not some cutting edge stuff,

Let's assume that they would maybe last around ~20 minutes or so.

Give or take, but I'm pretty sure that the runtime doesn't go above 30 minutes.
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Old 06-05-2012, 03:48 PM #10
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Default Re: Gold Plated 445nm 800mW Pen Build

The BlitzBuck V2 is approximately 75-80% efficient - not the most efficient thing in the world, but definitely more efficient than any other $15, FlexDrive-sized board out there. If I remember correctly, it should draw approximately... .8A or so? Maybe .9A? I haven't done any work with the V2 in a few months and I don't remember the testing I did.

Anyway, expect a revised V3 or even V4 version to come out when I get back from Chicago in this form factor with a pot, two high-powered modes (one for 1.2-1.8A, the other for 1.67A-3.1A) and about 90-95% efficiency >
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Old 06-05-2012, 04:00 PM #11
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Default Re: Gold Plated 445nm 800mW Pen Build

Well I was going with some reasonable assumtions, not to get precise figures but just something more like rule of thumb, an aproximation that should be somewhat of a reference.

95% efficiency you say?

I need to see that.
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Old 06-05-2012, 04:02 PM #12
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Default Re: Gold Plated 445nm 800mW Pen Build

That's the peak, which occurs at approximately 1.8-2.2A out.

And yes, yes you will

The boards available at CajunLasers now (the V3 rounds) are also capable of this. Just not in the same form-factor (instead, a 16.4mm diameter single-sided board).
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Old 06-05-2012, 04:25 PM #13
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Default Re: Gold Plated 445nm 800mW Pen Build

Hmm they are with trimmer on 'em.

What's the Vref? I'd like to remove the trimmer and place a fixed resistor if possible.
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Old 06-05-2012, 04:29 PM #14
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Default Re: Gold Plated 445nm 800mW Pen Build

Not as easy as that. The equation, however, for the high-powered mode (works equally well for currents less than 1.67A, just need bigger resistors) is as follows:

3636/i - 1174 = r
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Old 06-05-2012, 05:04 PM #15
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Default Re: Gold Plated 445nm 800mW Pen Build

Very nice laser you got there!

I recently received a laser in this same host, and I must say I'm impressed. It would be nice to have one with 445nm in it.

One question though... clipping the beam like that... are you concerned about back reflection, and wouldn't it add to the heat buildup?
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Old 06-05-2012, 07:17 PM #16
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Default Re: Gold Plated 445nm 800mW Pen Build

Not too concerned. Most of the little light that is being clipped is being absorbed into the focus tip and not being reflected back to the diode. This is just my educated guest. The inside of the back of the focus tip is no longer a smooth reflective surface. I have another one of these kits here waiting for a customer....hint hint.
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Looking for 445nm diodes? modules? drivers? lenses? Contact DTR!!!! He is the man.
https://sites.google.com/site/dtrlpf/home
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