On 22/11/2020 14:39, Dave Liquorice wrote:
> On Sun, 22 Nov 2020 14:12:52 +0000, Adrian wrote:
>
>>> Why USB? A Pi will do audio out without any extras, apart from
>>> perhaps a small analogue amplifier. Certainly well enough for a
> tiny
>>> speakers.
>>
>> My reading up on this before I started was that I would need an amp of
>> some description if I used the audio out, and space is limited,
>> particularly if I need to add in an extra power supply, so a basic Pi
>> powered is preferred.
>
> Quite a number of Pi powered DAC solutions some with on board amps.
> For tiddly speakers and non-HiFi you don't need masses of power or
> high voltage (ie > 5 V) power rails. 4 V (to avoid clipping and have
> a bit of headroom) into 8 ohms is 2 W or so, more than enough.
>
cheapo speakers will be about 80dB per watt at one meter. That's still
70dBm at 100mW.

That is loud talking level.



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Labour - a bunch of rich people convincing poor people to vote for rich
people by telling poor people that "other" rich people are the reason
they are poor.

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