Author Topic: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE  (Read 426 times)

Offline dBe

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #15 on: November 06, 2019, 11:13:44 PM »
Prototype adapter for iFi +5VDC coaxial to USB cable Mini-XLR connector.

Checked and +5VDC on center pin, sleeve is GND.

Now to seal the wiring up and give it a try.
:thumb:

Offline rollo

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #16 on: November 07, 2019, 07:35:21 AM »
  Confused. Are you using the iFi to power the power leg of the USB cable instead of the server port ?


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Offline HAL

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #17 on: November 07, 2019, 07:46:01 AM »
My dspMusik digital crossover/8 channel DAC needs to see 5VDC on the USB port to talk.  Trying to clean up the noise from the PC side by eliminating the USB 5V from the PC.

The cable was originally built by Dave to work with his BatteryBUSS.  Adapting it to the iFi 5V PS for use.

Offline rollo

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #18 on: November 07, 2019, 07:59:09 AM »
 OK. Would a separate battery [5V] or a iFi [5V] wall wart make a difference over using another port for power connection of USB ?


charles
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Offline dBe

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #19 on: November 07, 2019, 10:41:33 AM »
OK. Would a separate battery [5V] or a iFi [5V] wall wart make a difference over using another port for power connection of USB ?


charles
The short answer is yes.  Avoiding the common noise present between USB ports on the attached device is a good thing. However, and this is a BIG HOWEVER, the 3 pole filter that is in the power leg of the Split Power pretty well renders that question moot.  Also, the ground configuration in the Split power isolates the grounds between the transport, computer or streamer and the DAC or renderer.

So, this is a qualified "Nope".

Offline rollo

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #20 on: November 07, 2019, 12:07:54 PM »
  A good "Nope" that is. You guys did the engineering and I got the benefit. Well done.


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Offline tmazz

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #21 on: November 08, 2019, 12:37:37 PM »
Dave, If I am using the split cable to connect a DAC that has its own power supply and does not draw power via the USB port would I be better off just connecting the data side and leaving the power side of the split unconnected. It would seem logical that not having a power connection to the PC at all would be better than trying to clean up the messy power that the PC sends over. Is there a benefit or a need to keeping the power connected even if you are not using is (like does the DAC need to see a ground reference from the PC that it looks for on the power pins of the USB connection?)
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Offline dBe

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Re: TRIODE WIRE LABS SPLIT DATA AND POWER USB CABLE
« Reply #22 on: November 08, 2019, 02:25:55 PM »
Dave, If I am using the split cable to connect a DAC that has its own power supply and does not draw power via the USB port would I be better off just connecting the data side and leaving the power side of the split unconnected. It would seem logical that not having a power connection to the PC at all would be better than trying to clean up the messy power that the PC sends over. Is there a benefit or a need to keeping the power connected even if you are not using is (like does the DAC need to see a ground reference from the PC that it looks for on the power pins of the USB connection?)
Most DACs are going to need the ground reference provided in the Power side of the cable.  There is not one in the Data link because of the possibility of RF floating around on it.

Bottom line is to try it.  Can't hurt anything other than possibly not seeing the source.