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Old 22nd January 2013, 12:48 PM   #21
johnr66 is offline johnr66  United States
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Quote:
Originally Posted by Mihkus View Post
Its too damn hard to find cheap original parts...
I bought set of components for stereo TDA1514A amplifier...
Well, the legs of the ic looked shiny, like there were brand new, they looked really good :O
But damn, no protection at all, of any kind!
Pushed both of them over the limit with output of 31V 2,11A! and one of them blew apart.
Old thread but anyhow... Pushing the IC beyond it's max supply voltage may not allow the protection circuits to function properly. I'm not saying your parts are authentic, but even the authentic parts will only take so much.

I don't understand why people here will often push parts to or beyond their maximum ratings. I often don't go beyond 80 or 90%. If that doesn't get the job done, move on to the next stronger part.
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Old 22nd January 2013, 01:24 PM   #22
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I can honestly say that I've been lucky with E-Bay. No fakes so far.
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Old 25th January 2013, 12:32 AM   #23
tsiros is offline tsiros  Greece
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i don't know about you guys, but national (TI) sends samples.

i have four LM3886 and a LM1765 (1785? 1875? i don't recall) from them.

the IC itself is the cheapest part of the entire amplifier... essentially free. transformer, plugs (in, out, power) caps (if you don't trust the opamp to do common mode rejection) and case are the 100% of the cost. The ICs themselves are literally free.

Maybe because i am in university and they need a university email?
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Old 25th January 2013, 05:01 PM   #24
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yes fakes are everywhere. i hate them. after buying 4 of them i was able to find 2 with reasonably similar frequency response. the sad part is, nowadays fakes are so hard to distinguish from genuine ones. i actually came across some that are even laser enscribed.
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Old 26th January 2013, 09:58 AM   #25
AndrewT is offline AndrewT  Scotland
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Although "buying" samples from National cost me a bit more than using Farnell, I felt the extra security of knowing I had genuine National supplied chips and that was worth the extra cost.
Pity they restrict samples to 5 only.
I would like to buy direct from the manufacturers using their distribution system that they have set up for small quantity samples.
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