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...):
YouTube
Moral? Don’t cheap out. It’s not worth it. And...pcb layout is extraordinarily important.
Best,
Anand.
YouTube
Moral? Don’t cheap out. It’s not worth it. And...pcb layout is extraordinarily important.
Best,
Anand.
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?
Tom
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?
Tom
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 didn´t 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.
Notice this one provided same power as a 2030 would, and was damaged by short (surprisingly didn´t 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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