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12x Murder Fund! + Graph!

Krutz

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Re: 12x Murder Fund! (Complete!)

good question, i immediately wondered this too.
another idea would be a weak beamsplitter. take a piece of glass, like a microscopic slide, and shine the 4% (or 8%, both surfaces) reflection onto the sensor?

manuel
 



HIMNL9

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Re: 12x Murder Fund! (Complete!)

Yes, but you need an absorption chamber for manage the rest of the beam and block the light from outside, too .....

You can also use a thin piece of sanded glass, as diffuser, so it don't burn.


Edit: and if you don't find it already sanded, i just remembered one thing ..... in our color shop, there's for sale a product made for hobby glass etching ..... is like a gel containing hydrofluoridric acid (must be used with the opportune precautions, also if the concentration is low) ..... just get a piece of thin glass, like 1 mm thickness or similar, work on it until you get the needed dimensions and shape, then put that glass etching gel on both the surfaces and left it do its work ..... HF gel corrodes the glass, leaving you with a 2 faces "like-sanded" diffuser, already of the size you need, non melting and non fluorescent (and not reflective, too :p)

And if isn't enough, you can add a second, and so on, til they're enough ;)
 
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IgorT

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Re: 12x Murder Fund! (Complete!)

The GITD tailcap diffuser isn't going to continue glowing for the full "off" minute and cause the sensor to miss the count, is it?
Nope, the sensor will only react to the strong light created when the GITD tailcap is blasted directly, not the mild residual glow afterwards..

It's weak and dissipates very quickly, and i can make the sensor ignore it - IF needed, but i'll test it thoroughly first, don't worry... :yh:


The reason i want to use this is, that the entire thing starts glowing, when hit.. This means perfect alignment is less important..
At the same time it will ignore pretty much all other sources of light..
 
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Krutz

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Re: 12x Murder Fund! (Complete!)

uhoh! hydroflouric acid.. many people have amputated limbs or died from that stuff. not from those hobby-craft ones, but please take that stuff serious. the wikipedia article is a must before having *any* compound with HF around. if you have a butane stove and pans with teflon (ptfe) coating, that counts as a HF source too.. when handled wrong.

manuel
 

HIMNL9

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Re: 12x Murder Fund! (Complete!)

Krutz, LOL ..... i ALWAYS take all my chemicals with caution (especially with the ones i have around :p) ..... this compound have small percentage of HF inside, need time for work, but also with it i will always use rubber gum (you can find some assorted soldering iron marks on my fingers, but not chemical ones :))

Anyway, it was just a DIY alternative, just in case was impossible to find thin glass already "sanded" .....
 

Krutz

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Re: 12x Murder Fund! (Complete!)

..wasnt meant to you personally. i have this reflex to warn everyone whenever the topic HF comes up. its simply the most horrible substance one could possibly come in contact with. there may exist worse chemicals, but none of them will be that "easy" to access as HF.

all that doesnt necessary mean one should avoid it by all means. just to take serious care :)

manuel
 

IgorT

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Re: 12x Murder Fund! (Complete!)

Incidentally, i am also getting a Plextor 12x sled, thanks to bug373..

It's from the Plextor PX-B940SA 12x BR Writer drive.. Don't know much about it, this was the first time i heard about it actually, but bug373 found one and is sending it to me for testing and a build..

I won't actually get to torture it like our murder candidate here, but we will at least find out if it uses the same or a different diode..

Since the 12x diodes from the Pioneer drives seem to show a very characteristic behavior in their P/I plots, it will be interesting to compare them to another diode of the same or similar ratings (300-320mW Pulsed), even more so, if Plextor happened to chose a diode from another manufacturer!


The Plextor 12x is coming from Switzerland, so it will be here around the same time as the 12x Murder Candidate arrives, probably in about a week from now... :yh:
 

HIMNL9

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Re: 12x Murder Fund! (Complete!)

Mangled a Plextor ? :eek: :eek: :eek:

Here it's 265 Euro ..... 385$, more or less :p ..... Plextor brand always overpriced, here :p
 

IgorT

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Re: 12x Murder Fund! (Complete!)

Mangled a Plextor ? :eek: :eek: :eek:

Here it's 265 Euro ..... 385$, more or less :p ..... Plextor brand always overpriced, here :p
Wasntme... :angel:

I don't know how much it cost, but i think it's good to test as many different ones as we can find (and afford)...
 

daguin

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Re: 12x Murder Fund! (Complete!)

Wasntme... :angel:

I don't know how much it cost, but i think it's good to test as many different ones as we can find (and afford)...
AFAIK Plextor is a "re-brander" now. They just use someone else's drive. Are you getting the whole drive (or at least the whole sled) so we can see if they are using one we already recognize?

If not, can we get some close up pictures of the sled posted?

Peace,
dave
 

Hemlock_Mike

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Re: 12x Murder Fund! (Complete!)

Krutz --

You speak of the danger of HF acid. I agree. However, the post on etching glass says "hydrofluordric" acid. Is that the same as hydrofluoric acid or a typo? Some hobby chemicals are toned down a bit.

HMike
 

daguin

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Re: 12x Murder Fund! (Complete!)

Krutz --

You speak of the danger of HF acid. I agree. However, the post on etching glass says "hydrofluordric" acid. Is that the same as hydrofluoric acid or a typo? Some hobby chemicals are toned down a bit.

HMike
I can only find one entry for "hydrofluordic" in Google. I would guess it is a typo

Peace,
dave
 

Krutz

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Re: 12x Murder Fund! (Complete!)

its different names in different languages. we both spoke about hydroflouric acid. not 100% if thats the correct name, its HF (hydrogen and flour). thats the only way to etch quartz/glass. yes, the hobby version of that stuff is diluted, and as it seems, a gel, to minimize risk. but still.. weakly radioactive stuff is still radioactive, not? ;-)
(more or less the only stuff that really frightens me.. no control whatsoever, i guess)

on both, HF and radioactive stuff, people die. professionals, which work with that stuff routinely.
i would use hobby-grade HF if i had a good reason. but if i can avoid it.. ;-)

manuel
 

HIMNL9

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Re: 12x Murder Fund! (Complete!)

As far as i know, the correct term is "hydrofluoridric acid" in English (and "acido idrofluoridrico" in Italian) ..... and yes, the chemical is HF ..... as i've said, i'm not a specialized chemical worker, and the only acid i know that is used for etching glass, is this one.

Don't know about "hydrofluoric", maybe a typo ? ..... i doubt that is a different substance, cause also this word is related to HF chemical name ..... anyway, there's no correspondent correct "idrofluorico" word in Italian, also if i have seen used also it, in some articles ..... anyway, in these articles, the writer was indicating other substances with wrong names ..... as example, "perclorico" (percloric) for "perclorato" (perclorate) ..... "idroclorico" (hydrocloric) for "idrocloridrico" (hydrocloridric) ..... and so on, so, i'm pretty sure that this writer need more a course of Italian language, than a course of chemistry (and the worse thing is that the writer is Italian :p)

Never heard "hydrofluordic", anyway :p
 

daguin

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Re: 12x Murder Fund! (Complete!)

As far as i know, the correct term is "hydrofluoridric acid" in English (and "acido idrofluoridrico" in Italian) ..... and yes, the chemical is HF ..... as i've said, i'm not a specialized chemical worker, and the only acid i know that is used for etching glass, is this one.

Don't know about "hydrofluoric", maybe a typo ? ..... i doubt that is a different substance, cause also this word is related to HF chemical name ..... anyway, there's no correspondent correct "idrofluorico" word in Italian, also if i have seen used also it, in some articles ..... anyway, in these articles, the writer was indicating other substances with wrong names ..... as example, "perclorico" (percloric) for "perclorato" (perclorate) ..... "idroclorico" (hydrocloric) for "idrocloridrico" (hydrocloridric) ..... and so on, so, i'm pretty sure that this writer need more a course of Italian language, than a course of chemistry (and the worse thing is that the writer is Italian :p)

Never heard "hydrofluordic", anyway :p
Here's the MSDS for hydrofluoric acid.

HYDROFLUORIC ACID

Notice the synonyms:

Fluorohydric acid; fluoric acid; Hydrogen fluoride solution

I think that Himnl9's translation is probably from the first synonym.

In any event, it looks like we are all talking about the same chemical compound described in the data sheet.

AND it is dangerous stuff!

Peace,
dave
 

maxh

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Re: 12x Murder Fund! (Complete!)

its different names in different languages. we both spoke about hydroflouric acid. not 100% if thats the correct name, its HF (hydrogen and flour). thats the only way to etch quartz/glass. yes, the hobby version of that stuff is diluted, and as it seems, a gel, to minimize risk. but still.. weakly radioactive stuff is still radioactive, not? ;-)
(more or less the only stuff that really frightens me.. no control whatsoever, i guess)

on both, HF and radioactive stuff, people die. professionals, which work with that stuff routinely.
i would use hobby-grade HF if i had a good reason. but if i can avoid it.. ;-)

manuel
Concentrated hydroxides (NaOH, KOH) will also etch glass.
 




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