Listen to this good news - we now have an all in one digital audio amp breakout board that works incredibly well with the 

The squarish board with two chips on it is the transmitter (power with 9V).  The longer board is the output and you can connect that to the part of your project that...

Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This...

Wow, is this not the most useful thing you did not know existed or what? It's a switching wall adapter where you can easily change the voltage! It's like a benchtop supply you...