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400mW spartan b4 and after pot mod

kcorbhv

kcorbhv

0
Joined
Jun 25, 2010
Messages
160
i just pot modded my spartan ,in this photo before and after you can see its brighter now :)

400mwspartanb4andafterp.jpg


cimg5292t.jpg
 
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it was very easy to get out of the host.

why what? also what do these numbers mean?

400mwspartanheatsink.jpg
 
pot mod a cheapo greenie ok...
but pot modding a spartan:tsk:......

you didnt even measure current right?
you just turned the pot?
 
no i just turned the pot while the laser was on and settled when the laser was at its brightest.
 
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.
 
the only thing in between the diode and the exiting beam is that small lens you see
 
HumanSymphony said:
Could you take pics of the driver(s) please :D top, bottom, in between :whistle:
Click to expand...

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.
 
kcorbhv said:
it was very easy to get out of the host.



why what? also what do these numbers mean?
Click to expand...


I interpret the numbers and letters to mean -

poo = 480

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


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 -

21jumps.jpg


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

Thanks,
jeff
 
Benm said:
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.
Click to expand...

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?


Cheech said:
"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.
Click to expand...


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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