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was hoping to be able charge the DAC from the TVs USB port
You can get a USB cable as long as your optical cable.
The (potentially #pretentiousaudiophilecunt) option is a battery. A cheap powerbank could provide low noise power to your DAC for days, for about £20
A
1s & 0s are either there or not, analogue signals change more with longer cables as a cable is a form of LCR filter