Instructables user petachock posted this great tutorial on how to make your own pi powered hifi:
I had a pair of old speakers from a Sony hifi I had in the 90’s and wanted to have a semi-portable hifi that I could use in the kitchen and outside in the summer.
I use XBMC on my home theater system and saw that there is a few distro’s that are based on it so having researched a bit I decided to go with OSMC which seemed like a good solution for a Raspberry Pi 2.
I did need an amplifier and not being good at electronics I needed to buy one so I went with a cheap one from e-bay that is often used in cars and motorbikes. After plugging it in and testing it I was happy with the result for such a low price of £16.
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Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.