klirren_65
Member
Millions of mobile phones rot in the drawer, because of missing security updates, weak battery etc.
A small amount to give them a "dignified" second life:
a. Hardware
In general smarthphones support the audio stream out via USB (to the next DAC). Bit for bit - without losses! And if wireless charging will be supported, perfect, there is no need to power off for recharging.
b. Software
The following two software recommendations come from f-droid.org, a software portal - no advertising or tracking, open source, etc.
en.wikipedia.org
Getting the apps, you do not need a membership of the famous US-company.
RadioDroid: Look up online radio streams at RadioBrowser and listen to them.
AntennaPod: Easy to use and adjust Potcast-Manager
c. low budget solution
Samsung Galaxy S5 (20 $) equiped with a free custom-rom (Android 7.x)
Have fun!
A small amount to give them a "dignified" second life:
a. Hardware
In general smarthphones support the audio stream out via USB (to the next DAC). Bit for bit - without losses! And if wireless charging will be supported, perfect, there is no need to power off for recharging.
b. Software
The following two software recommendations come from f-droid.org, a software portal - no advertising or tracking, open source, etc.

F-Droid - Wikipedia
Getting the apps, you do not need a membership of the famous US-company.
RadioDroid: Look up online radio streams at RadioBrowser and listen to them.
AntennaPod: Easy to use and adjust Potcast-Manager
c. low budget solution
Samsung Galaxy S5 (20 $) equiped with a free custom-rom (Android 7.x)
Have fun!
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