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Old 08-25-2010, 09:13 AM #1
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Default 400mW spartan b4 and after pot mod

i just pot modded my spartan ,in this photo before and after you can see its brighter now






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Old 08-25-2010, 10:19 AM #2
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Default Re: 400mW spartan b4 and after pot mod

why? thats all i have to ask... got any power tests???
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Old 08-25-2010, 10:56 AM #3
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Default Re: 400mW spartan b4 and after pot mod

it was very easy to get out of the host.

why what? also what do these numbers mean?

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Old 08-25-2010, 05:26 PM #4
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Default Re: 400mW spartan b4 and after pot mod

pot mod a cheapo greenie ok...
but pot modding a spartan......

you didnt even measure current right?
you just turned the pot?
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Old 08-25-2010, 05:55 PM #5
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Default Re: 400mW spartan b4 and after pot mod

no i just turned the pot while the laser was on and settled when the laser was at its brightest.
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Old 08-25-2010, 05:57 PM #6
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Default Re: 400mW spartan b4 and after pot mod

You are risking your laser. The fact that it still works is a good sign, but you might overload the diode, driver or optics and break your laser within days.
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Old 08-25-2010, 07:12 PM #7
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Default Re: 400mW spartan b4 and after pot mod

And why didn't you just buy the 1 watt version for the same price???
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Old 08-25-2010, 07:51 PM #8
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Default Re: 400mW spartan b4 and after pot mod

the only thing in between the diode and the exiting beam is that small lens you see
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Old 08-25-2010, 08:02 PM #9
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Default Re: 400mW spartan b4 and after pot mod

Could you take pics of the driver(s) please top, bottom, in between
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Old 08-25-2010, 08:11 PM #10
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Default Re: 400mW spartan b4 and after pot mod

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Originally Posted by HumanSymphony View Post
Could you take pics of the driver(s) please top, bottom, in between
It looks to me like they are running a couple of their "regular" drivers in parallel.
The drivers appear to be identical.
They also look similar to the drivers used in their high power greens.
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Old 08-25-2010, 09:32 PM #11
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Default Re: 400mW spartan b4 and after pot mod

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Originally Posted by kcorbhv View Post
it was very easy to get out of the host.



why what? also what do these numbers mean?



I interpret the numbers and letters to mean -

poo = 480

i.e. after 480mA, your laser turns to sh*t.


Just curious, but you've pot modded a laser with two drivers? Did you turn the pots on both drivers? How have you made sure they are balanced?


Also, your pictures are also too big. They should be no bigger than this -



800 x 600 pixels. Can you resize them so that I, and others, can see them all at once please.

M
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Old 08-25-2010, 10:32 PM #12
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Default Re: 400mW spartan b4 and after pot mod

2 drivers 1 pot
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Old 08-25-2010, 10:39 PM #13
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Default Re: 400mW spartan b4 and after pot mod

"800 x 600 pixels. Can you resize them so that I, and others, can see them all at once please."

You can always press (ctrl) + (+ or -) to resize the page quickly on pc.

You got some balls kcorbhv.
I don't know if I would risk it but thanks for the pics.
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Old 08-26-2010, 12:50 AM #14
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Default Re: 400mW spartan b4 and after pot mod

Sounds like risky business to me, especially without measuring even current to get some remote idea of what you are doing. Without initial values for that, i would even be hard to return the laser to its factory setting if you wanted to.

I'm all for experimenting, but precautions are sometimes needed, and measurements always are.

As for this specific case: It seems like both boards are current sources, so there should be no problem with adjusting only one of them. Their combined output will be sourced (or sunk) to the diode - connecting current sources in paralel is like connecting batteries in series: you get the added total, regardless of equality between the sources.
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Old 08-26-2010, 01:33 AM #15
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Default Re: 400mW spartan b4 and after pot mod

You should read about pot modding. I would suggest you turn your laser down before you break it.

Thanks,
jeff
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Old 08-26-2010, 02:10 AM #16
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Default Re: 400mW spartan b4 and after pot mod

Quote:
Originally Posted by Benm View Post
Sounds like risky business to me, especially without measuring even current to get some remote idea of what you are doing. Without initial values for that, i would even be hard to return the laser to its factory setting if you wanted to.

I'm all for experimenting, but precautions are sometimes needed, and measurements always are.

As for this specific case: It seems like both boards are current sources, so there should be no problem with adjusting only one of them. Their combined output will be sourced (or sunk) to the diode - connecting current sources in paralel is like connecting batteries in series: you get the added total, regardless of equality between the sources.
Thanks for that Benm. It seems in this case that there is only one pot so I would assume it controls both drivers at once rather than just turning one up further, (?), but, in the case of two seperately controlled drivers, wouldn't it stress one more than the other? I know they should both be comfortable individually at whatever current but one would heat more than the other if they were unbalanced, correct?


Quote:
Originally Posted by Cheech View Post
"800 x 600 pixels. Can you resize them so that I, and others, can see them all at once please."

You can always press (ctrl) + (+ or -) to resize the page quickly on pc.

You got some balls kcorbhv.
I don't know if I would risk it but thanks for the pics.

Thanks Cheech, I realise this but the site asks for a maximum size of 800 x 600 so it's polite to resize them I think.

M
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