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Counterfeit/Fake vs. Real TDA chip video
Counterfeit/Fake vs. Real TDA chip video
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Old 5th November 2017, 12:18 PM   #1
nycavsr2000 is offline nycavsr2000  United States
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Counterfeit/Fake vs. Real TDA chip video
Angry Counterfeit/Fake vs. Real TDA chip video

This is an excellent video complete with die exposure and actual testing of said TDA chip to illustrate the dangers of not buying your favorite chip at an authentic parts warehouse (i.e. Digi-Key, Mouser, Newark, etc...):


Moral? Donít cheap out. Itís not worth it. And...pcb layout is extraordinarily important.

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Old 5th November 2017, 05:03 PM   #2
tomchr is offline tomchr  Canada
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I am amazed by the examples of fakery. I'm even more amazed that it makes financial sense for the manufacturers of the fake goods, in particular when it comes to faking electronic parts.

Some examples of fake products are just horrid. Like the $1 cell phone chargers that are likely to become fire hazards. Or electrolytic capacitors where the writing on the can says 450 V, but the part actually contains a smaller cap rated for 200 V. Or baby formula tainted with lead or antifreeze.
In case of the amp chip in the video, the damage was minimal. The chip didn't explode. It did turn into a power oscillator which could damage your speakers, though.

There are many amp chips out there. For a new project, why not just design something around a genuine part that's currently in production? The parts are pretty cheap even through the official distribution channels. Mouser, Digikey, Newark/Farnell, RS, Jameco, etc. will happily sell you the parts, even in DIY quantities.

Those plugboards used in the video are known awful and useless for anything that resembles performance circuitry. It's not just the contact resistance that limits performance. The inter-row capacitance is quite large as well (on the order of 100 pF as I recall). That tends to be a pretty severe performance limiting factor. Layout matters. Who knew?

MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
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Old 6th November 2017, 03:37 AM   #3
PRR is offline PRR  United States
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I'm wondering if this "2050" might really be a 2020 or 2010, one of the lesser TDAs. Re-marking is cheaper than making.

However there's lots of physical clues that this was a 2nd-rate factory, even if it is some form of TDA.
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Old 6th November 2017, 06:29 AM   #4
JMFahey is offline JMFahey  Argentina
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They are usually cheap and plentiful TDA2030, relabelled 2050.

Notice this one provided same power as a 2030 would, and was damaged by short (surprisingly didnīt explode) , I *guess* because it was subject to 2050 rail voltages; again guess that if subject to proper rail voltage (+/-14V instead of +/-22V) , it might even survive a short.
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Last edited by JMFahey; 6th November 2017 at 06:35 AM.
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