Mike Easter wrote:
> The adapters I saw w/ or w/o audio out were comparable in price; $10 w/o
> audio ... $13 w/ audio

So, those economical adapters have sufficient circuitry inside to do the
DAC for the audio and video.

I was curious about how much +5V HDMI current was available for that
circuitry and found this thread in the RPi section of stackexchange:

https://raspberrypi.stackexchange.com/questions/45001/how-much-current-can-i-dr
aw-from-each-models-hdmi-socket
  How much current can I draw from each model's HDMI socket?


--
Mike Easter

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