05-15-2023, 02:34 PM
(This post was last modified: 05-15-2023, 02:36 PM by TheOldPresbyope.
Edit Reason: typo
)
@nosferatu_cat
All that performance in a nice case for about the same as I paid for my bare Khadas Tone1 a few years ago. Sweet.
I did note the sparse technical specifications for the SU-1 state
The standby power number is negligible.
OTOH, at 5VDC the power consumption number suggests the maximum current draw is < 1A without giving any further details. Could be 0.99A and still be < 1A.
For most Pi models, the maximum current we can draw from the USB ports is 1.2A in total, so if you are using more than one USB port, you may want to monitor your Pi's behavior. moOde now helpfully reports in its System information log if throttling has occurred (although I'm uncertain if it is only reported if it occurs during startup) while undervoltage messages show up in the Linux system log.
This is a limitation of the Pi's USB subsystem and applies even if the power supply can sustain much higher current draws.
Full disclosure: 'Suffering' undervoltage events and even throttling isn't the end of the world. Depending on your circumstances, you may or may not notice any audible effect. YMMV, as they say.
As an aside, I read through the posts from readers in the ASR thread for this DAC. Even on ASR, some of the exchanges were just plain silly. However, one useful question which got asked several times but which I didn't see answered is: does the SU-1 automatically switch between the USB and S/PDIF inputs and, if not, how does one do that? As you build up your own experience with this DAC I'm sure we'd like to see a SU-1 thread in this subforum.
Regards,
Kent
All that performance in a nice case for about the same as I paid for my bare Khadas Tone1 a few years ago. Sweet.
I did note the sparse technical specifications for the SU-1 state
Quote:Power Consumption:<5W
Standby power:<0.1W
The standby power number is negligible.
OTOH, at 5VDC the power consumption number suggests the maximum current draw is < 1A without giving any further details. Could be 0.99A and still be < 1A.
For most Pi models, the maximum current we can draw from the USB ports is 1.2A in total, so if you are using more than one USB port, you may want to monitor your Pi's behavior. moOde now helpfully reports in its System information log if throttling has occurred (although I'm uncertain if it is only reported if it occurs during startup) while undervoltage messages show up in the Linux system log.
This is a limitation of the Pi's USB subsystem and applies even if the power supply can sustain much higher current draws.
Full disclosure: 'Suffering' undervoltage events and even throttling isn't the end of the world. Depending on your circumstances, you may or may not notice any audible effect. YMMV, as they say.
As an aside, I read through the posts from readers in the ASR thread for this DAC. Even on ASR, some of the exchanges were just plain silly. However, one useful question which got asked several times but which I didn't see answered is: does the SU-1 automatically switch between the USB and S/PDIF inputs and, if not, how does one do that? As you build up your own experience with this DAC I'm sure we'd like to see a SU-1 thread in this subforum.
Regards,
Kent
