On 2020-11-23, Adrian  wrote:
> In message , John
> Aldridge  writes
>>Another "not what you asked for" post, but might a cheap battery powered
>>bluetooth speaker do the trick? E.g.
>>
>>https://www.amazon.co.uk/dp/B01HTH3C8S
>>
>>Which I've just tried on my RPi4, but I don't see why it wouldn't work
>>on a RPi3.
>
> Thanks.
>
> It says that it will play for 15 hours, but it gives no indication as to
> what the battery life is if it is turned on, but not playing (e.g.
> standby).  Something else that I didn't mention in the original post, is
> that this would be on 7*24, although it may not be used at all on any
> given day.  So anything battery powered is unlikely to be suitable.
>

I knocked up my own. Bought a little class D audio driver board like this ...

https://www.hobbytronics.co.uk/mono-audio-amp

wired power (5 volts) from the RPI GPIO pins, and wired a connection
from the audio output as input, and hooked up a small lowpower 8ohm
speaker. At 1 watt it will pull a little more than 0.2A from the RPI
PSU, so make sure you have the power budget. But when it was quiet it
pulls a lot less - sorry not measured it, but being class D it should be
pretty low.

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