The 797 is a DIL right I ordered som SO-8 opamps from this seller Adelleparts 2010.Do you think that they can be fake to?
Ebay -
Start a case - item not as described (ie fake).
Get resolution - refund.
Leave feedback - 'seller refunded as item was not as described (fake)'.
It would seem that if you contact seller directly and receive a refund then by Ebay's lights they have done no wrong, the buyer was inconvenienced but not out of pocket.
Start a case - item not as described (ie fake).
Get resolution - refund.
Leave feedback - 'seller refunded as item was not as described (fake)'.
It would seem that if you contact seller directly and receive a refund then by Ebay's lights they have done no wrong, the buyer was inconvenienced but not out of pocket.
Not op amps but Ive come across fakes of fakes would you believe with Li-on
batteries. The Ultrafire ones are a kind of fake in that they claim impossible
mah ratings and there are fakes of those which dont have protection circuits
when the lettering on them says they do. This could be dangerous.
As has been said "they" will fake anything.
batteries. The Ultrafire ones are a kind of fake in that they claim impossible
mah ratings and there are fakes of those which dont have protection circuits
when the lettering on them says they do. This could be dangerous.
As has been said "they" will fake anything.
Done no wrong? What about the thousands sold to other buyers who were deceived and never got a refund. That is ok with you? Ebay could do something about the criminals instead of turning a blind eye, deleting negative feedback and continuing to profit on the continued sale of fake and counterfeit products.
With thousands of AD797 sold and thousands of OPA1612 sold how many "reviews" and "impressions" posted on forums and sites (like diyaudio) are misleading because they are unknowingly "reviews" and "impressions" of fakes? I have also noted a series of accounts with different names but suspiciously similar photographs and listings with many more AD797 and OPA1612 sold. It looks like the "seller" runs a whole network of different named accounts on each e-commerce site. I doubt the other AD797 sold on the other "replica" listings are any less fake.
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So are the battery monitor and protection circuit chips in those batteries fake chips themselves? Do those protection circuits do anything? A fake product manufactured with fake components?
The batteries are fake, the protection circuits non existent or not functional even though they might exist, whatever. It feels like any combination you could come up with probably exists it the depths of AliExpress or ebay. Just not trustworthy at all, especially considering the damage Li-Ion batteries can do.
I do not buy on the bazaar and do not have an account at ali baba. Meanwhile there are many chinese sellers selling from Germany - so they deal under Germans laws. The one that tricked me on e-bay with crap got a corresponding review from me. I did not go for any replacement or even refund and this seller sent me several e-mail urging me to give a better review. No way. Besides the sellers its the greedy customers buying the cheapest stuff, unboxing it, finding it crap, call for the seller, get it all refunded without needing to send back the items and afterwards give a review "top seller"
I do not have to support this kind of business model.
I do not have to support this kind of business model.
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These fakes are everywhere, resold from European and US frontmen. Don't buy chips from auction sites.
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I measured the noise (sum of op-amp, LNA and heavily filtered ultra low noise reference) of a variety of op-amps today include the fake AD797.
The fake AD797 measured 33.8 nV/rtHz while the data sheet is 0.9 nV/rtHz. Thousands of these were sold by AdeleParts2010.
In my test setup the sum of OPA1612, LNA and heavily filtered ultra low noise reference measured 1.9 nV/rtHz.
The fake AD797 measured 33.8 nV/rtHz while the data sheet is 0.9 nV/rtHz. Thousands of these were sold by AdeleParts2010.
In my test setup the sum of OPA1612, LNA and heavily filtered ultra low noise reference measured 1.9 nV/rtHz.
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Just spotted the latest, greatest, must be fake op amps on the block from China:
USED OPA620 SG single op amp ceramic seal gold plated surface operational amplifier IC upgrade opa627 NE5532|Home Automation Kits| - AliExpress
I thought 'they must be fake' then I had second thoughts 'why go to all the bother of making such elaborate fakes instead of the usual sand the top surface down and re-print?'
Anyways, if anyone decides to buy these, please report back on what you get, whether fake or not.
USED OPA620 SG single op amp ceramic seal gold plated surface operational amplifier IC upgrade opa627 NE5532|Home Automation Kits| - AliExpress
I thought 'they must be fake' then I had second thoughts 'why go to all the bother of making such elaborate fakes instead of the usual sand the top surface down and re-print?'
Anyways, if anyone decides to buy these, please report back on what you get, whether fake or not.
@sumotan - I had the impression Jack Ma wasn't directly involved any more, he announced 'retirement' a couple of years back. In any case I doubt his personal wealth has much to do with management decisions at the business.
With recycled chips I've not found fakes so far. Its the ones that look like new we should be wary of.
With recycled chips I've not found fakes so far. Its the ones that look like new we should be wary of.