On Fri, 23 Aug 2019 13:56:46 -0700, 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 expect there is just a single, SOC type, chip that does the lot and
it's up to the adapater maker to decide what features are made
available to the user. Remember that there is more to such an adapter
than just the DAC. Each end of the HDMI talk to each other to find
the "best" resolution and bit rates they have in common.

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

That was a slight concern for the one I bought but it works fine
connected to Pi3B+.

--
Cheers
Dave.

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