Popular Post marce Posted June 7, 2017 Popular Post Share Posted June 7, 2017 17 hours ago, Albrecht said: It is not designed to output a consistent, clean, noise free, audio signal. (My apologies, I am not as good at explaining SI & the issues as John Swenson, & several others, here and elsewhere). So no, it is not an apriori assumption: under comparative analysis, regenerating the USB signal that is produced by 1 of the ports on the bus, *can* affect the signal & produce a cleaner signal that *some* components may take advantage of. It does not transmit an audio signal, it is a digital serial data bus and the audio is transfered as a digital signal... I am impressed with the number of threads and posts what is in fact a basic USB hub is getting... Sal1950 and crenca 2 Link to comment
Popular Post marce Posted June 7, 2017 Popular Post Share Posted June 7, 2017 16 minutes ago, Jud said: Well, a basic USB hub with a 4-layer PCB, an isolator chip, and 200+ components (selected with some care - for example, as @PeterSt mentioned earlier in the thread, the UpTone folks contacted the makers of the isolator chip to discuss chip behaviors and specs that hadn't been documented). It is a basic USB hub, they all are pretty basic, used the same chip numerous times. It is pretty standard for these sort of products, and is a pretty basic digital layout. Glad to see they did add proper isolation (something I whinged about personally when these hubs first appeared). I am currently doing a test board for wavefront sensor, 1000+ components and 8 layers... next week I'm back in sunny Winbourne doing a 14 layer flexi rigid board and later back onto a controller board with well over 2000 components 8 layers (and we have a design with about 20,000 components on!!!), all the previous with selected components as two are life/mission critical and one is to test sensors for space, so all got to be noise free and have the utmost signal integrity... So in the wider world of electronics a USB hub for a professional design team is not a overly complex job... jabbr and Jud 2 Link to comment
marce Posted June 7, 2017 Share Posted June 7, 2017 5 of us worked on it, it was a experimental sensor array for a portable X-ray machine, so mostly sensor arrays, with 8 FPGA blocks for the sensor sections... impedance controlled length matched... it destroyed many a sensitive mind. Most boards these days are mostly SMD parts, ranging from the 0.127mm pitch SOICs, still the favourite choice for analogue layouts where space allows, down to 0.4mm pitch BGA's with 0201 caps between the pins. To me it doesn't make much difference I just zoom in on the screen (age has taken its toll on my eyesight though, I can barely see the finished boards without a magnifying glass these days.) Got any close ups of the ISO regen board? Jud 1 Link to comment
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