fried diode

& you got a +5 from me -PM anytime you need-- Len

Xirr-----
Many of us have been there for many years.
Simply buy a new diode and install it yourself
and WOW -- it lives again!!!
I've never seen the funeral for a diode like this.
Put in a new diode and let it live again. ZAP
HMike

the first 'diode-ectomy/ transplant' can be scary

Agreed it can be intimidating if you have no experience.
If it's a little out of your league, set it aside, build a few from scratch, and when you go to repair it, you'll be wondering what you were so worried about

Alot of the conversations here make it seem much more complex than it really is. And as far as a diode replacement, two wires and your finished assuming it's just the diode that's shot.
With all the "pre-wired" and "preset" drivers, these things are damn near finished when they are delivered.
Plug and burn host, pre-wired module from DTR, your looking at a 5 minute build. Soldering iron, shrink wrap, Allen key, done. Big boy Lego set


I would grab a 501B from Mrcrouse ($20) a pre-wired m140 with x drive 1.7w ($100) solder 2 wires, and you have a close to 2w pocket 445nm for $120, and the satisfaction of building your first laser.

Spoken with Mrcrouse and now you've told me the exact module to drop in so Ive got no more excuses

Thanks Tmack for that particular s list from dtr!

I have two 445already though but Amy 12mm module with driver and lens will drop in the same as the specific one you mentioned right? Id rather hAve a 650ish nm or 405nm

Yeah when you change the re-build to another color it less easy--


good luck bro!

hK

hakzaw1 said:

Yeah when you change the re-build to another color it less easy--


good luck bro!

hK

Click to expand...

Exactly. It was a 405 originAlly id like to keep it that way

Whew 400mW of 405 is pretty hot! and with its small dot very quick to burn anything-
and as our eyes do NOT see it as being
'bright' our pupils dilate and when they are bigger- more 405 gets thru and our eyes natural lens makes it even worse.. I added a 405 pen as a gid=ft to a buyer and the day it arrived (his first look at a 405 and he apparenly knew nothing about its danger-) he PMed me saying the pointer i sent must have had almost dead batts SO he GAVE it to his kids to *PLAY* with-
to him it looked harmless -
- I was on-line when he PMed and quickly replied-- it we go by how 'bright' a laser is when judging danger we would think IR was harmless-- not true at all..

I no longer send free 405s unless I am sure the receiver knows about 405- danger-

The easy field test is: Look away- do you see afterimages ( you will almost always see them) BUT if they persist then you saw too much. This is one way to judge the safety of audience scanning- it an awesome thing to behold when done right - as the images fade quickly and allow you to go on enjoying the show- IF you are getting overexposed your eyes no longer see the continuing show as easy- seeing mostly the after-images ..
go to Pangolin.com and look for the pages on audience scanning as they explain it much better than I have.

405nm s have a special looking dot and splash effect and yes it was 400mw of purple and the host focused it so well it'd burn nearly as well as my 2w 445 it was pretty crazy. Had a visible beam in a lit room . Now I've got an unknown power
405nm pen.. bright dot but no visible beam unless its totally dark or fog or smoke is present in the air.

Look at its dot definitely left lasting after imAges which is when I stArted using goggles while using it. Though our eyes may not perceive it as efficiently as other wavelengths it doesnt mean its less dangerous. Actually it'd make it more dangerous as a high power 405nm can cause serious damage but doesnt appear bright so its less intuitive that your eyes are still being exposed to the same amount of photons or photon energy

Okay-- got out my notes from LSO
Under : Biological effects of Laser radiation on eye and skin tissue.
Most common is eye hazards and less commonly , skin.

'The intensity of a laser beam can be increased thiusands of times by the time it reaches the retina due to how small the eye focuses the light down to.

so even just a fraction of a second can cause injury--- Pulsed with high rep rate can even cause 'ACOUSTIC' Shock Wave damage!! for these reasons the laser should never be fully powered until AFTER all alignment and alignment inspections are done. (laser projectors)

"There is one type of adverse effect which may be seen in light show lasers.
"Blue light hazard" Some blue and green laser wavelengths can cause damaging changes to tissue due to a type of photochemical reaction within the skin itself more so than other longer wavelengths are capable of. This reaction is very different from thermal tissue burns and may occur with long term exposures of significantly lower power levels than longer wavelengths require to cause similar damage.''

scary stuff

len

Makes sense. Shorter wavelengths mean more energy per photon. Now obviously with lasers you can bypass this physics law by simply supplying more power. Also small wAvelengths tend to interact more with molecular structure as the lArge wAvelengths sine dont have the power and the photons dont hVe the small probability wave to cause nearly as damAge. It simply means the higher the wavelength the less chance an incidental photon will contact molecules in yiur cells and thus impart their energy. Most is converted to heat but single photon of sufficient power can break apart a molecule. Its all thermal interactions but the hermal aspect becomes less apparent when we s re talking about damage caused by short WL photoNS.

Remember particle duality when contemplating this subject.as it helps to understand a photon even a single one still behaves as a wave. Almost as if the photon sees the future. If this interest s you I suggest reading the pretty well known double slit experiment. And Brian Greene has three books that are amazing reads if you are into the physics of light and how particles and waves behave. Ps keep in mind dualities are a paradigm for u drrstanding physical quantum processes and dont need to be taken literally

Edit... sorry for bad grammar typing frkm phone as most of u know

The biggest thing isn't shorter wavelength light having more energy per photon, but having a higher frequency due to their lower wavelength. So in a given amount of time you have far fewer 660nm photons hit than 405nm hit. This means that the surface you are hitting has more time to dissipate the heat with 660nm. This is why lower wavelengths seem like such better burners.

Frequency isnt related to the number of photons emitted in other words its more qualitative then quantitative aspect of the wave half of how light behaves.. That would be amplitude you are referring

Edit.. with all due respect of course I tend not to disagree wi th any vet especially someone as knowledgeable about lasers as you are.

Hmm, yes amplitude does seem to fit better with the concept I have in my head. Names are hard lol.

Aye. When it comes to light alot of things are relative and terms are easily mixed up. You had the concept correct just mixed the terms up.

Here is why basically. Due to the Heisenberg uncertainty principle and other laws in quantum mechanics the "wave" part of light is thought of just as a wave of probability. The photon is in a unknown state (And also simultaneously in all possible states as well according to our current quantum mechanical laws. Weird eh?).I.e velocity acceleration position and momentum until viewed or interacts with another particle. A larger wavelength in Effect means a larger probability wave and and as these waves are much larger then the molecules people are made out of thAt means the incident photon has a chance to skip by without incurring damage. Larger wavelengths therefore give the photon more freedom of uncertainty as to its state at any given point of time. This is why low wavelength 405nm lasers seem to be such burners relative to their milliwattage compared to reds etc.. red photons have a larger wavelength and thus essentially has more wiggle room to skate by any of our molecules and being absorbed into an electron and then remitted as heat.

Hope that is a satisfactory answer!

Edit.. youll notice i just elaborated on wannaburnstuffs post he essentially had it correct

my black dominator's diode died... it shines just enough to see it even after charging up the batteries over night.... how hard would it be to replace the diode?