Layout uitproberen op papier en daarna gaten aftekenen.
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voor de liefhebbers, glimmende schroefjes.
Moderators: Barry2001, Beheerdersteam
Wat Barry al aangeeft. Je dient dus eerst een NDA te tekenen voordat je de beschikking krijgt over de datasheet. Je tekent er voor dat je allerlei details onder voorwaarde van geheimhouding mag inzien. Je mag dus niet zomaar broncode vrijgeven waaruit de aansturing van de diverse chipregisters blijkt. Ook mag je geen schema, met daarin opgenomen het ic, vrijgeven.ray5150 schreef:Wat houd dat dan precies in, Peter, die NDA ?
Can be, but it is hard to imagine for me how can be a chip fake. There is one possibility:knuisje schreef:From Aliexpress they are most certainly fake.
If you buy a chip from alieexpress, eBay and/or a chinese reseller, AND it is much cheaper then when you buy it from an official distributor (or a reliable reseller like Digikey/Mouser/Farnell), you can be almost certain it is fake.csigabiga schreef:Can be, but it is hard to imagine for me how can be a chip fake. There is one possibility:knuisje schreef:From Aliexpress they are most certainly fake.
The package is the same but the name (text) has been changed. I solder this fake IC and by the testing it does not functioning. Ok, I solder it out and give a negative rating for the seller.
If the IC does functioning like the original, than it must be the original because of I think it can not be manufactured in a garage or so.... and a DAC is too much special to simply find a very cheap drop-in alternative.
But please say if my logic is wrong!
It all depends on your definition of fake, obviously the IC package can easily be faked and contain no actual semiconductor die inside. However a more realistic possibility, and one I've seen a few times already, is that the ICs that don't make the spec, i.e. rejects or earlier prototype runs, don't end up in the schredder, but are sold by vendors online like Aliexpress et al. You'll then receive an IC that might seem functional at first glance, but fails to perform up to specification, which basically invalidates your design, as it offers sub-par performance.csigabiga schreef:Can be, but it is hard to imagine for me how can be a chip fake.
deze dus.Volgens mij bedoelt hij een zekering tussen de netspannigs aansluiting en de primaire wikkeling
Je ziet ook alles, gaat aangepast worden.hannesie schreef:Terug kijkend naar de foto's, dan zie ik consequent gedraaide kabeltjes, op 1 setje na Zwart/rood/zwart/rood Klopt dat?