03-23-2019, 12:02 PM
(This post was last modified: 03-23-2019, 12:07 PM by TheOldPresbyope.
Edit Reason: added "post edit"
)
@Rinaldi
I'm having trouble understanding your diagnosis:
How did you discover the cause was "low current"?
Looking through the IFI website, I found a single reference to the supply requirements of your DAC: "Power consumption: <1.5W". Since the input voltage is nominally 5V DC, the current demand must therefore be <300mA DC. That's well within the capability of even early RPi models.
In any case, I'm dubious that "low current" caused the iDAC2 to fail. I can't figure out what specifically would fail due to current starvation. Based on my own experience, I'd be suspicious mundane causes such as voltage spikes or grounding issues between the RPI/iDAC2/amplifier.
That's the rub. If the actual cause hasn't been identified, then the risk still exists.
Good luck.
Regards,
Kent
[POST EDIT] Oops, I didn't see your latest post until after I replied.
You ask
No. The 1.2A number is the maximum which can be drawn safely through the RPi USB lines. The actual draw is dependent on your iDAC2, which as I showed above, should be less than 300mA (0.3A) according to IFI spec.
I'm having trouble understanding your diagnosis:
Quote:I discovered that the usb output damaged the dac because of low current, and now I received the dac with a new board and am afraid the same problem will occur.
How did you discover the cause was "low current"?
Looking through the IFI website, I found a single reference to the supply requirements of your DAC: "Power consumption: <1.5W". Since the input voltage is nominally 5V DC, the current demand must therefore be <300mA DC. That's well within the capability of even early RPi models.
In any case, I'm dubious that "low current" caused the iDAC2 to fail. I can't figure out what specifically would fail due to current starvation. Based on my own experience, I'd be suspicious mundane causes such as voltage spikes or grounding issues between the RPI/iDAC2/amplifier.
Quote:If you connect the "Max USB Current 2x" will the idac2 work correctly without risk ??
That's the rub. If the actual cause hasn't been identified, then the risk still exists.
Good luck.
Regards,
Kent
[POST EDIT] Oops, I didn't see your latest post until after I replied.
You ask
Quote:the high current of 1.2A of the RPi USB output may have been the cause to damage the dac ???
No. The 1.2A number is the maximum which can be drawn safely through the RPi USB lines. The actual draw is dependent on your iDAC2, which as I showed above, should be less than 300mA (0.3A) according to IFI spec.
