I consider having an FM radio in a Bluetooth speaker essential, as well as having SD card and 3.5mm input. The Simpowel V8 fulfills these needs for under $40.
Quick setup Bluetooth sound (speaker) on Linux PCs and embedded single-board computers, including the Intel Edison.
Setup and enable/disable Bluetooth on Linux devices
Instead of compiler-dependent and OS-dependent proprietary, fragile sound playback from Fortran, consider system call to external player–such as ffplay.
Examples of play, record, process live audio from Python, cross-platform
Here are a few simple cut and paste commands to install PyGame, allowing easy sound playback from Python.
How to record or monitor what’s playing through your speakers via Pulseaudio and pavucontrol.
Easy install Goldwave audio editor on Linux using WINE. WINE 2.x allows Goldwave 6.x to work, while WINE 1.x allows Goldwave 5.x to work on Linux.
GNU Radio (and Companion GUI) install/run via Windows Subsystem for Linux for network-connected SDR and simulations.
A cross-platform (Windows/Linux) visualization of sound spectrum is enabled via Python, PyAudio and VisPy using QT. Check it out!
Detailed review of Soundbot SB240 and SB220 Bluetooth headphones–noting some problems with modern Bluetooth source devices.
Soundblaster Roar 2 FCC ID IBAMF8190 technical includes details of operation including apt-X
Even $2 Bluetooth speakers can work OK. Better to get multipoint speaker for real investment.
Repairing a Dell speaker bar that had no audio.
force Bluetooth headphones to be recognized on Linux, and force Linux Bluetooth audio mode via pavucontrol
Suggested engineering college / high-school / maker projects
Numerous beneficial modifications to improve Yaesu VX-7 performance.
detailed example of how a radio system can suffer poor performance due to initial deployment or degradations, and how they can be fixed.
Block diagram of NASA Space Shuttle audio rebroadcast for Amateur Radio
Audio spectrum sweep in 30 second steps consisting of: 400Hz, 1200Hz, 2100Hz, 2300Hz, 2500Hz at -3dB.
easy to build interface between PC and radio for Echolink, PSK31, WSPR, etc.
Why are so many EF Johnson 800 MHz designs from 1980s-2000s microphonic?
The streaming internet audio provided by forward-thinking AM stations allows quality license-free rebroadcasts.
As CD-R writers become commoditized, some people don’t realize CD-R have a short lifetime, and even standard CD’s don’t live forever.
With WWW broadcasting using RealAudio starting to take off, some might prefer higher quality downloadable audio.