Re: [mpg123-devel] [mpg123-users] A round of testing of upcoming mpg123 1.27.0, please.

[Thomas O. <tho...@or...>]

Am Thu, 1 Apr 2021 20:53:07 -0400
schrieb Alan Corey <ala...@gm...>: 

> Raspberry Pi ZeroW, about 3 inches long, cost $10 from Adafruit.
> Plugged it and the USB sound card into a DrOk power monitor and
> they're using 1.25 watts (0,25 amps) idling.  So solar powering them
> would be no big deal.  Listening to some Pink Floyd with Koss R/80
> headphones, sounds fine.  I have a touchpanel LCD, one project would
> be to retrofit a boom box.  Oh, CPU usage, the peak I saw watching top
> was about 13%.

Nice. MP3 decoding really is no big task anymore for small hardware.
Though, you could compare the generic decoder with the neon one. Would
be more than 13%, I presume.

Regarding solar power: I got a 4 inch speaker with an extensible Tube
as cabinet vor bass response and a little chip amp (class D) embedded,
behind a supercap and a step-up converter. A 12 W panel is plenty to
work it, even with moderate sun being available. With the efficient
class D amp, the mean power draw is way below your 1.25 W. You just
need the cap for bass-heavy transients. The simple joys of life;-)


Alrighty then,

Thomas