LPF Site Supporter
- Jun 24, 2010
Nice. So when you get the one I am sending you which is a pull from a Mitsubishi core test the wavelength and compare to the the one you are holding and maybe some basic efficiency numbers as well. A interesting point with Ncha diodes is that pulls will be more consistent where diodes distributed though the gray market can be like a box of chocolates "you never know what you are going to get" if you don't have a supplier that is honest and actually has knowledge up to the source. I have yet to find a china seller that actually knows any details except the production model number.Yeah, I use mine to heat sink diodes I am testing for wavelengths. So, they don't get exposed to high currents.....just threshold and drive currents. Mostly the new Sharp diodes and my NDB7675s as there was some rumor that they were NDB7875s instead. Glad to say they are both the real deal and brand new....no tinned pins. Wish I could remember what wavelength they both measured, but that was many months ago.
Nic contracts for production runs with a main customer that has an agreement to buy x amount of units with x tolerances for the specs they need for their product which is companies like caxio for their units or mitsu before they do a run. Small batches of engineering samples are made and send to prospective companies. These are the datasheet snippets that the grey market suppliers use to make all the fake datasheets that accompany these diodes. They get out as they are more loosely distributed than final sheets as every purchase agreement comes with a NDA which prohibits distribution of datasheets. These get edited with the model number which they pretty much always know as they trays usually show up with the part number on them just the bar codes ripped off and none of the paperwork they send with every batch that has the specific bin info of the batch.
This is why I roll my eyes every time I see an E at the end of a model number in a listing. It is possible to see the T but not all that likely as they are just the first batch produced by the final process to test and to tweak any issues that might be in the manufacturing process or make refinements to get a higher yield of the target bins. So the point is all the target bins go to the fulfill the contract and ones that fall outside for any number of factors get sold off with a lot of them getting backdoored into the gray market.
This may not be a bad thing as the needs of the porojector company to get the right conversion rate to green light and have a blue wavelenght that is useable in the mix for color ballance may not be what others are after so this is not a they get the best but they get what they know they are ordering and have consistancey. Batches on the gray market can swing a lot and if your supplier or maybe their supplier is not very honest there are batches that have defects of one kind or another. Maybe a group that were produced and something was off cauusing high failure rate, missing lasing line, off angle emitter, really whatever. I got hosed with a defect batch of NDB7A75's from a china which had a dye defect. Crooked angle and this big round halo that when you put a lens on you had a crooked beam inside a second light emission that was like a flashight shown as a huge circle around the dot. Another time I had a batch of NDB7875's that just did not wan tot go over 2A. A few blowing and most lasing just stopped between 1.6A and 2.2A which they took back the ones that did not blow up.
Anyway give it a test would be interested in seeing how they differ if they do.
When referring to MItsu cores above I mean back in the begging mitsu designed a line of hybrid projectors not long after the caso ones had been out for a year or two. Probably just getting into the A140 line but saw how the whole A130 thing went over like a led zepplin and for several other decided not to manufacture them. Instead they took what they designed and sold them as drop cores which from what I gather ended up being a very good move and profitable not having to deal with retail distribution. These are the ones that are in the acrs, viewsoni, Optom, and others. (yes I am spelling proper names wrong on purpose)
On the email you sent I will shoot you a label. I am not in a rush to get the one you have and still have the label from the other day I can send you this one with. Just swap the label and contents when you get it as no need to pay for priority if that is all you can print.
bunch of great posts-- especially from Jordan who I welcome back home..
you have done your homework.. thanks!!!
do you think scrap copper was used to make the AixiZ copper modules..??
I seem to remember something about getting their copper from DTR .. I can ask for samples if any vet wants some to test..I will ask AixiZ if there have been more than one source at AixiZ for copper.
I try very hard to do as much as I can to prevent any metal bits-copper/ally/brass etc from getting into anything ever....
I use a powerful vaccuum - canned air and go slow and keep everything horizontal. I dont want gravity to cause problems.
Sleds arrived today and ready to fwd Sat morn.
pics and details on my experience with the harvest posted here asap.
a few tricks-tips etc -- I was sent a DOA to practice 'the harvest' and glad of that.
I am sold out.
thanks again for all the valuable posts.. please post again..
be sure to practice ESP precautions--no returns- all pretested as good.
sounding like use of a TEC is callled for..
Yea Chuck used to get them from me not sure what he is doing for them now but makes sense to source his own. Yea copper and lots of other metals will be getting downgraded here before too long. This is a good read.
Or this expert from a previous study.
Copper Demand for copper has increased dramatically over the last few decades. From 1991 to 2015, the world total extraction has doubled, going from 9.3 million to 18.7 million tonnes. Available data suggest that the world copper reserves are 720 million tonnes and the identified resources approximately 2.1 billion tonnes  while other studies state that the ultimately recoverable reserves could be 2.8 billion tonnes . At present, the global average copper ore grades for copper mines is approximately 0.62% of Cu content  and this number is expected to decrease as mines with higher ore grades become exhausted [17–19]. Starting from this information, the concern over the future availability of copper is on the rise, and several studies have focused on estimating the global copper peak production using Hubbert’s model, which has been estimated to be between 8 and 40 years from now [16,20–24]. Copper is currently mined using both underground and open cut methods and there are basically two main processing routes, depending on the type of ore present, sulfides or oxides. After ore sorting and grinding, used in both types of ore, the main technique used for concentration of sulfide ores is froth flotation followed by smelting and refining (pyrometallurgical process) while in the case of oxide ores (and some low grade sulfide ores) a heap leaching process is combined with solvent extraction and electrowinning (SX-EW) (hydrometallurgical process) . In the pyrometallurgical process, the ore is mined, concentrated, smelted and refined. The sulfides are separated from the gangue material using flotation to form a concentrate containing 25% to 35% of copper . During smelting, the concentrate is fed to a smelter, along with oxygen and a reductant such as coking coal, where sulfides are oxidized producing a blister of 97%–99% of molten metallic copper that is later purified by electrolytic purification to pure copper . From the 1980s a new technology emerged, commonly known as the heap leach–solvent extraction/electrowinning process (HL-SX/EW), although only 10% of the primary production comes from this hydrometallurgical route . This process operates at ambient temperatures and the copper is dissolved to produce a copper sulphate solution through heap leaching, after which the copper is recovered through SX-EW to produce pure copper cathode.