NFC Type 4 can operate within a distance of 10 centimeters. NFC, which is compatible with ISO 15693 that is capable of NFC phones, can operate within a distance of 100 centimeters.
The size of an NFC antenna is related to
Lees verder: Telecom
#PCB-ontwerp
I am prototyping a PCB, using Chip Quik’s “SMDSWLF.031, a Sn96.5/ Ag3.0/ Cu0.5 solder with 2.2% no-clean flux. I find that the black spots appears frequently in larger pads on my board. I wonder if it is because I left the soldering iron more time heating the solder and that burnt the flux. What is that black residue? Is that a sign of a bad joint or maybe bad soldering technique?
Ik bestelde PCBA voor IoT-apparaat en ontving het hardwareproduct van goede kwaliteit. Echter, er is een proces dat ik eerder negeerde – firmware-ontwikkeling op basis van de hardware. How should I move on?
I’ve ordered fabrication and assembly of small PCB batches (100st) a couple of times already. Each time the factory asked me if I want to do test on the PCB. But I don’t what to do about it. And I test them by myself. Vervolgens, the result of the testing is unacceptable with 15% soldering problems. So bad. I think I will ask the supplier to test them before delivery.
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