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My Transistors, original or copy?
My Transistors, original or copy?
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Old 10th August 2015, 07:24 PM   #661
anatech is offline anatech  Canada
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My Transistors, original or copy?
Hi Walter,
All you can do is buy and try, then identify those vendors who sell fakes. Keep in mind that anyone can run into fakes, it's probably more difficult for them to keep their stock clean. No sense in beating a source down that is normally a good one. Just be fair, as you have been here.

-Chris
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Old 10th August 2015, 07:47 PM   #662
kees52 is offline kees52  Netherlands
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Why companys do not support DIY electronics groups, these fora do really put knowledge in the world, High end audio in the first place is a discrete community, do not want ic,s and such but pure parts.

Companys see not the importance of it, maybe starting a company making these parts is a market hole who can be filled, special with make them real high end .

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Old 11th August 2015, 01:57 AM   #663
anatech is offline anatech  Canada
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My Transistors, original or copy?
Hi kees52,
Quote:
Why companys do not support DIY electronics groups
There is no money in it for them.
Quote:
High end audio in the first place is a discrete community, do not want ic,s and such but pure parts.
That isn't always true. Integrated circuits have their strengths and weaknesses. They can perform better than discrete circuits sometimes.
Quote:
maybe starting a company making these parts is a market hole who can be filled, special with make them real high end .
I am afraid that audio is a tiny market, not worth pursuing in economic terms. But face it, surface mount parts are here to stay and folks like On Semi and Fairchild make some of the best transistors. The National Semiconductor collection of companies, plus Linear Technology make the best IC's on average.

Due to massive abuse of their samples programs (On-Semi & Fairchild for example), they have closed that down to legitimate designers. To some, audio DIY people are more trouble than they are worth. I can remember a time when ordering samples was reasonable in cost. Now, the golden goose is dead and we have to find distributors that sell the parts we want. Even non-audio parts that I use.

Getting real parts will be even more difficult for those of us who need them. The rest of us will have to be happy simulating circuits.

-Chris
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Old 11th August 2015, 10:18 AM   #664
kees52 is offline kees52  Netherlands
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Oke thanks for the explaining I do agree i that also high end guys has to go smd, I have already a lot of restistors caps in smd form, now to go use them, but I am 58 so eyes get less good, but good glasses wil work, I do think by buy a pc camera who do magnify and so I can do make it.

The J-fets I ded understand was the problem?, I do use them in my amps, also I use tubes in it who do well.

Th alexander amp I have now simulated, this with a opam a integrated one haha, but it is a burr brown opa 627 because not al opamps can be used in this current feedback amp on picture left and a local feedback allfet amp on the right.. I do use here these Jfets, normal transistors are indeed enough to find.







regards

kees
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Old 11th August 2015, 10:28 AM   #665
kees52 is offline kees52  Netherlands
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I have here some pictures of 50 amps igbt,s for welder inverter, I see the pins looks strange, you now when these are fakes it is dangerous with such 5 kW equipment.
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Old 15th August 2015, 02:34 PM   #666
AndrewT is offline AndrewT  Scotland
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They look like they have been recovered from an assembly.

Maybe because some pre-production samples failed during final testing.
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Old 15th August 2015, 07:27 PM   #667
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by AndrewT View Post
They look like they have been recovered from an assembly.

Maybe because some pre-production samples failed during final testing.
The left are rectifier diodes and looks oke, but the igbt,s has much solder on the pins, just testing with big current when pcb ts ready wil give the truth,

regards
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Old 15th September 2015, 04:35 PM   #668
Rafael S. M. is offline Rafael S. M.  Brazil
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Hi !

Anyone ever heard about the MULTICOMP manufacturer ?

I was looking for originals MJ15003 and 2N3773 and I found this manufacturer on the Farnell Store in Brazil

They are around 30% cheaper than On Semi, here the datasheet http://www.farnell.com/datasheets/313115.pdf
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Old 15th September 2015, 04:40 PM   #669
AndrewT is offline AndrewT  Scotland
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Farnell sells many lines that are marked Multicomp.
Open a datasheet and you see their name again.
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Old 15th September 2015, 10:22 PM   #670
Rafael S. M. is offline Rafael S. M.  Brazil
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Then Multicomp is a Farnell manufacturer ?

So can I buy this transistors, they aren't counterfeit ?
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