Cheap ebay op-amps. How do they do it?
Dec 13, 2005 at 11:20 AM Thread Starter Post #1 of 13

steinba

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I just bought some op-amps off ebay, and can't help but wonder how it is possible to sell lots of brand new ICs that are supposedly sourced from large mail order electronics companies, for less than half of what I'd have to pay for identical chips from the large online shops directly. How do they manage? What kind of deal do these sellers have?

Not that I mind, though. Far from it. I'm just curious.
 
Dec 13, 2005 at 11:43 AM Post #2 of 13
Quote:

Originally Posted by steinba
I just bought some op-amps off ebay, and can't help but wonder how it is possible to sell lots of brand new ICs that are supposedly sourced from large mail order electronics companies, for less than half of what I'd have to pay for identical chips from the large online shops directly. How do they manage? What kind of deal do these sellers have?

Not that I mind, though. Far from it. I'm just curious.



They probably get free samples from TI and then sell them on ebay. You too can get free samples from TI.
 
Dec 13, 2005 at 11:43 AM Post #3 of 13
Really simple, theese guys sell free samples which can be ordered from big IC manufacturers (completely for free). And thats the reason why TI stopped offering free samples of their audio opamps.

2PinkFloyd, few seconds faster :)
 
Dec 13, 2005 at 12:16 PM Post #4 of 13
That would explain it, if it wasn't for the fact that some of the sellers I've seen, seem to have quite aa large supply as well, and many different chips. I guess one can't get away with very many free samples of the same chip? (or many different chips, for that matter.)
 
Dec 13, 2005 at 12:27 PM Post #5 of 13
There are legitimate resellers who onsell production over buys. This is an interesting trade in parts that might be left over after a production run has finished. Say a few tens to hundreds of parts. These are essentially worthless to the owner, and difficult to put back into any supply channel. So they go for whatever a specialist dealer can get for them.

On the other hand there is also a very nasty trade in fake parts. I have personally seen part numbers being carefully erased from chips, clearly ready for a new part number to be emprinted. I would never trust an OPA627 that was bought from anyone other than an acredited BB dealer. I know of one dealer who when asked if he had a particular (expensive) part was known to say - "not right now - this afternoon I can have some." Just enough time to get the right number printed onto a rail of generic op-amps. The other dealers in the same building knew he did this.
 
Dec 13, 2005 at 12:32 PM Post #6 of 13
Quote:

That would explain it, if it wasn't for the fact that some of the sellers I've seen, seem to have quite aa large supply as well, and many different chips. I guess one can't get away with very many free samples of the same chip? (or many different chips, for that matter.)


im sure if you were a large user of IC's like a large manufacturer or educational institution you would be able to get a lot more samples then the public who order on the website. thats my bet on their origin.
 
Dec 13, 2005 at 1:29 PM Post #7 of 13
You'd be surprised what can be claimed as free samples given the correct FAKE credentials. A mate of mine abused the system to all hell. Managed to get some 48 digital volume controls amongst other parts over a period ofa few months till TI pulled his account.

At least he didn't sell them and actually needed 48 of them but in general people like this make me sad for the legitimate users.
 
Dec 13, 2005 at 1:43 PM Post #8 of 13
Quote:

Originally Posted by Garbz
You'd be surprised what can be claimed as free samples given the correct FAKE credentials. A mate of mine abused the system to all hell. Managed to get some 48 digital volume controls amongst other parts over a period ofa few months till TI pulled his account.

At least he didn't sell them and actually needed 48 of them but in general people like this make me sad for the legitimate users.



What on earth did he need those for? DIY mega-mixer?
 
Dec 13, 2005 at 2:54 PM Post #9 of 13
basically but not for recording. It was for playback basically setting up a store front which had that many speakers. It was basically a GIANT multichannel amp with an remote to control the volume of each channel individually.
 
Dec 13, 2005 at 6:34 PM Post #10 of 13
Quote:

basically but not for recording. It was for playback basically setting up a store front which had that many speakers. It was basically a GIANT multichannel amp with an remote to control the volume of each channel individually.


Seems to me anyone having enough loot to do the rest of the setup should have the integrity or a minimum of honesty to play it straight considering how cheap the TI parts are compred to the rest but crooks always look to steal first and only pay as a last resort.
I have been lucky in the free samples arena and have had pretty much unlimited access to any parts I desired (even some seriously expensive ones) for years but never once have I abused the system.
I use it as it is meant to be : Parts evaluation for new designs and when I terst something that looks promising go to a supplier for any future quantities so everything has always been a single part or if a mono chip two.

One thing everyone should take advantage of is the availability of free literature from the major semiconductor companies.I have easily three shelves of data books and design guides that i use daily for reference and would take over free sample parts every time.Some of the "better" ones :

1-ADI : Analog-Digital conversion
2-Cirrus Logic Product Guide
3-ADI : A Designers Guide to Instrument Amplifiers
4-ADI : Op Amp Hardware and Housekeeping Techniques
5-National : Analog Product Databook
6-LT : Linear Applications Handbook Volume l,ll,lll
7-LT Linear Family Data Books-seven volumes and weighs about 20 lbs !
8-Intersil Product selection Guide
9-Beldon Master Catalog
10-Various DSP manuals

Toss in all the circuit design CD ROMS they offer,a few product specific books/catalogs,monthly newsletters and product announcements and there is a serious start to a design library.Waaaaay more valuable than ripping off a couple of parts to save a buck or two while learning nothing,including what the word "honest" or "stealing" means......................
 
Dec 13, 2005 at 8:06 PM Post #11 of 13
Quote:

Originally Posted by PinkFloyd
They probably get free samples from TI and then sell them on ebay.


The biggest clue as to when this is happening is when they come in lots of 5, which is TI's limit per part for samples.
 
Dec 14, 2005 at 12:32 AM Post #13 of 13
agreed the literature is awesome. I have several fat volumes here from various companies. Mostly though product guides. Still great for when looking for something. I challenge anyone to find a product to fit a certain application faster then me using the net
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