I would suggest you to have a look at the documentation of the CY3280-MBR3 Evaluation Kit, schematics and BoM. The kit has got a buzzer connected and in the BoM you will see the kind of device attached.
One solution might be to use WaveDac, freq can be changed, and feed that to a small
electromagnetic speaker. That would require an external amp, there are many parts in
the 25 cent range that can do that. TI, ONN, ROHM......
The WaveDac can supply sine which gets rid of the annoying harmonic problem, and
by muxing clock to wavedac or using APIs you could do tone sequences.
Sorry, no WaveDac in an MBR3
Having looked at the wrong part (me) the best way to make
a buzzer sound non raspy is twofold -
1) Pick it for a natural resonance in the range you want. That maximizes
2) RC filter it to suppress harmonics, the principal cause of crappy
3) Plastic enclosure also helps in shaping the overall sound quality
Drive it differentially to maximize loudness. When you do place
diode clamps to each rail on the GPIO pin to eliminate transients
on the GPIO pins outside their allowed range.
Thank you for the responses. @Dana, I will give it a try.
You are always welcome!