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Old 28th November 2012, 10:20 PM   #31
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I have nothing but good purchases from online components.
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Old 28th November 2012, 10:21 PM   #32
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Quote:
Originally Posted by qusp View Post
even Digikey and mouser have been burned lately
This should be very disturbing.
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Old 28th November 2012, 10:21 PM   #33
labjr is offline labjr  United States
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Quote:
Originally Posted by qusp View Post
even Digikey and mouser have been burned lately
How do they get burned? Don't they get parts directly from the manufacturers?
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Old 28th November 2012, 10:25 PM   #34
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Quote:
Originally Posted by Blink_PT View Post
China has destroyed the trade in almost all over the world, counterfeiters are in almost everything, have contributed to the crisis World.

If paid by Paypal, make a complaint to paypal and get your money.

Both Tranton Shenzhen Electronic Technology Co., Ltd. as the Elcodis.com are companies that sell fake stuff.

I received emails from two.

I asked to the two photos, one said he sent the photo with the product, not the other responds, the Tranton sold each to $ 10, the Elcodis sells $ 37.5 each.

Photos true.

Click the image to open in full size.


Mail to me...
--------------------------------------
Hello dear

Thank you for the request. I have a quotation for you.

Item: (SJEP120R100A )
Quantity requested:4
Quantity available: 4
Price per item: 37,5 USD
I can send you the order in 3-5 days after payment.

I will also need your shipping address to calculate shipping cost. Please let me know if you have any shipping account.

We accept payment by:
1.Wiretransfer (30 USD fee)
2.PayPal (5% from the total amount of the order)

If you need more details for this quotation don't hesitate to ask me.

Regards,
Marina
Most interesting. Marina kept her mind on the money and did not bother to offer to attach the performance specifications of the device. Is the alleged fake a Thyristor, a bjt or an out of specification R100A? Where is SemiSouth as these semiconductors flood the intended [power switching] and the by the way diyaudio markets? Who is going to take the fall? Great opportunity to haggle with Marina or other. A $1 per item or bust. Are you getting Au or Cu?
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Old 28th November 2012, 10:43 PM   #35
qusp is offline qusp  Australia
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Quote:
Originally Posted by labjr View Post
How do they get burned? Don't they get parts directly from the manufacturers?
to be clear I dont know of any specific part or any part that they sold, but no not everything is bought direct from manufacturer, there are some from authorized distributors too, it depends on the parts. and people, employees will try to insert fakes into real orders. if they werent being burned or attempts made to burn them, they would have no need for the stringent testing they have in place to make sure they dont pass them on.

they periodically make statements about tracking/reporting fake parts on their site

Last edited by qusp; 28th November 2012 at 10:47 PM.
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Old 28th November 2012, 10:44 PM   #36
flg is offline flg  United States
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Well, I don't think we're done checking devices yet. A diode connected to the right pins could pass the test I just described.
BTW, the circuit I described can be used for simple Vgs matching too. On MOSFETs also. Reverse everything for P ch devices. You can play with the voltages and the resistor to get any current you want.
I don't think I wanna screw with, or describe to anyone, how to check d-s breakdown or anything(1200V). But it is somewhat of a unique parameter not expected to be found in to many other devices. Rdson is pretty easy and although they use 12A you will likely, as in MOSFETs do, get the same results at much lower currents. You might get about the same numbers with an IRFP240. But, if you did the first test you would have thrown it away already after finding out how much voltage g-s it takes to turn it on(4V).
Gotta think about it some more???
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Old 28th November 2012, 10:57 PM   #37
labjr is offline labjr  United States
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I guess you have to stock up on the parts as soon as Nelson says he's using them in a design and before they're discontinued. A lot of diy guys don't want to spend the money at the time and then get bruned looking for the parts afterward.

I'd be curious to know if Nelson has gotten burned?

Would be funny if he used some counterfeit parts and the amp had a sound to die for, with no way of identifying the original parts.
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Old 28th November 2012, 11:15 PM   #38
qusp is offline qusp  Australia
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yes well we all know that parts can sound better and offer a nice soft clipping when pushed hard, sometimes above their stated max (eg 2sk170 etc) what about when they are literally in their death throws because they are not the part you thought they were?
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Old 28th November 2012, 11:17 PM   #39
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by labjr View Post
....
Would be funny if he used some counterfeit parts and the amp had a sound to die for, with no way of identifying the original parts.
certainly not possible , from many reasons
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Old 28th November 2012, 11:44 PM   #40
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Those of you who experienced first hand this phenomenon of fake [buzzforb], please define it clearly. Preferably, please give a specific example which stood out. A production run ususally give a distribution of performance. Is the population of devices which happened to be on the fringes of a potential broad distribution the alleged fakes?
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