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Chip Amps Amplifiers based on integrated circuits

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Old 12th February 2013, 01:42 AM   #11
routhun is offline routhun  United States
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I bought couple of kits/parts from Chinese ebay sellers they are all worked fine for the price I paid. If the price is too cheap quality was also like that. But if you avoid too cheaper items and buy from reliable sellers there is no reason for panicing. I frequently bought from Along..., Skubli, MiniShow sellers, I've really amazed by the quality/price of those items. Especially some of the PCBs are of very high quality and tolerated lot of abuse of soldering/desoldering. But a blanket statement of bad about all eBay Chinese sellers is not helpful for the person asking a question.
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Old 12th February 2013, 07:28 AM   #12
blu_glo is offline blu_glo  England
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I second the idea to just buy the PCBs and get semis (especially) locally....
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Old 12th February 2013, 07:48 AM   #13
back is offline back  Greece
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Originally Posted by blu_glo View Post
I second the idea to just buy the PCBs and get semis (especially) locally....
yeah but they will cost a lot more like that.
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Old 12th February 2013, 09:09 AM   #14
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Originally Posted by blu_glo View Post
I second the idea to just buy the PCBs and get semis (especially) locally....
This is NOT a blanket endorsement but those in the electronics manufacturing business here in China ONLY use imported 'complex' ICs or the latest in technology.

For mundane passive and active parts, Chinese made stuff seems fine. For the more complex, or more advanced, or more esoteric go with well established sources.
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Old 12th February 2013, 02:07 PM   #15
johnr66 is offline johnr66  United States
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Any audio IC I bought shipped in from China was fake. When I tested them, I found they lag in performance and may lack the built in circuit protections. When I cracked open the case, I found the die size to be 1/3 of the authentic part. No way it will last very long.

At the price of those kits, I have strong doubts about the parts.

There are good dealers who deserve your money.
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Old 12th February 2013, 02:37 PM   #16
routhun is offline routhun  United States
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yeah but they will cost a lot more like that.
The output transistors in the first kit you've mentioned in your first post seems to be fake as the price of the entire kit is almost as low as the 10 output genuine output transistors. Yes, genuine parts cost more, that is the price you need to pay for quality
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Old 12th February 2013, 02:54 PM   #17
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Any audio IC I bought shipped in from China was fake. When I tested them, I found they lag in performance ....When I cracked open the case, I found the die size to be 1/3 of the authentic part.
Just to clarify, as I understand the terms:

fake part - a part that is rubbish or so badly off spec it is useless

unlicensed copy - factories produce according to OEM 'blue-print'
however it does not mean it matches the original specs

mis-labeled - a part labeled as better than it is, trivial example would be a TIP31B being labeled as a TIP31C
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Old 12th February 2013, 03:04 PM   #18
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Originally Posted by routhun View Post
The output transistors in the first kit you've mentioned in your first post seems to be fake as the price of the entire kit is almost as low as the 10 output genuine output transistors. Yes, genuine parts cost more, that is the price you need to pay for quality
On the other hand, the rule-of-thumb is that if something cost X amount overseas from the factory, it will retail for 3X
And electronics seem to suffer from a high retail mark-up - I have seen the exact same item made in China selling from 5X to even 10X in the USA.
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Old 12th February 2013, 04:49 PM   #19
blu_glo is offline blu_glo  England
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Caveat emptor - you makes your choices you pays your monies, don't expect miracles for nothing and you won't be dissapointed!
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Old 12th February 2013, 05:15 PM   #20
routhun is offline routhun  United States
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On the other hand, the rule-of-thumb is that if something cost X amount overseas from the factory, it will retail for 3X
And electronics seem to suffer from a high retail mark-up - I have seen the exact same item made in China selling from 5X to even 10X in the USA.
I completely agree with you on exorbitant prices on some of these items in USA. One example is when I replaced digitizer on my Garmin Nuvi GPS, price of that item from US sellers was almost 4 times of that of Chinese sellers. I bought from Chinese seller and its working fine for couple of years now. If not for these Chinese eBay sellers, most of these commodity electronic stuff is not repairable for sane prices and end up in the dump.
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