I needed a quick alarm tone generator for a piezo speaker, and with no 555 at hand, this turned out
For the circuit that was constructed for testing (based on the Application circuit in the data sheet, the v3 copy
This single-IC circuit is pretty basic but is enough to get the TEF6606 audio up to (very loud) headphone levels.
High sensitivity (36dB gain), tested for low harmonic distortion and flat frequency response (1dB down at 40Hz, flat past 30kHz).
This board is a generic audio controller with decent sound. It was designed for an ipod but can be used