02-18-2021, 03:27 AM
Thanks Tim, Drone7 and OldPresbyope,
Problem solved. I swapped out the Schiit supplied USB cable for something I had on hand, the power cable from the powered hub, and, again, voila! There's the Schiit.
Is it a faulty cable or did Schiit supply no-standard cable? Yet tbd.
I appreciate your ideas. Thank you, again. They are all spot on concerns to review for any system issue. Here's what I've been thinking:
I wouldn't expect PS capacity issues; RPi.org specs the bare board active current at at 600 mA. So plenty of headroom on the 3A PS especially in this case with nothing else connected to the board. The PS would be worthless if it didn't handle the small transient loads of the USB ports. And I'm guessing that any inductive load on the RPI is going to require an interface, driver and its own PS. That said, you can't offhand rule out faulty PS, or board.
EMC/RFI? mmmm, maybe but probably not in this case; these devices all have been working separately in the same space prior. Though if suspect it can easily be evaluated by just moving the device(s) across the table or across the room, moving the electrical connections, etc.
I considered the USB hub influence so I tore apart the hub to see what was inside. Didn't have time or inclination to evaluate the circuit or devices employed. Thinking about it though. if the hub signal processing was to provide a favorable interface to the Schiit but the RPi weren't that would be just a happy coincidence for the hub as this was just some random off the shelf device. And, as another data point, the Schiit was working with my laptop.
Rocinante remains the first and foremost hack
-DQ
Problem solved. I swapped out the Schiit supplied USB cable for something I had on hand, the power cable from the powered hub, and, again, voila! There's the Schiit.
Is it a faulty cable or did Schiit supply no-standard cable? Yet tbd.
I appreciate your ideas. Thank you, again. They are all spot on concerns to review for any system issue. Here's what I've been thinking:
I wouldn't expect PS capacity issues; RPi.org specs the bare board active current at at 600 mA. So plenty of headroom on the 3A PS especially in this case with nothing else connected to the board. The PS would be worthless if it didn't handle the small transient loads of the USB ports. And I'm guessing that any inductive load on the RPI is going to require an interface, driver and its own PS. That said, you can't offhand rule out faulty PS, or board.
EMC/RFI? mmmm, maybe but probably not in this case; these devices all have been working separately in the same space prior. Though if suspect it can easily be evaluated by just moving the device(s) across the table or across the room, moving the electrical connections, etc.
I considered the USB hub influence so I tore apart the hub to see what was inside. Didn't have time or inclination to evaluate the circuit or devices employed. Thinking about it though. if the hub signal processing was to provide a favorable interface to the Schiit but the RPi weren't that would be just a happy coincidence for the hub as this was just some random off the shelf device. And, as another data point, the Schiit was working with my laptop.
Rocinante remains the first and foremost hack
-DQ
