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Hello,
I have tried to find dedicated forum for newely launch MBR series but could not find it. Hence I am posting this question here in this form. Accept my apology for this. We have got newely launched CY8CMBR3110 chip and we have developed custom boards using this chip. Its working like a charm. Now we want to provide audio feedback for touch. As CY8CMBR3110 has dedicated buzzer pin we are planning to use that pin only. I think to use piezo buzzer will not be the best solution as sound produce by piezo buzzzer could be annoying. So I am looking for various options which can generate very good audio feedback. What is best way to achieve this? Is there any other ICs available which can be used?
Thanks,
Niral
Solved! Go to Solution.
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PSoC 3
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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
loudness.
2) RC filter it to suppress harmonics, the principal cause of crappy
sound.
3) Plastic enclosure also helps in shaping the overall sound quality
properties.
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.
Regards, Dana
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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.
Bob
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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.
Regards, Dana.
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Sorry, no WaveDac in an MBR3
Bob
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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
loudness.
2) RC filter it to suppress harmonics, the principal cause of crappy
sound.
3) Plastic enclosure also helps in shaping the overall sound quality
properties.
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.
Regards, Dana
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Thank you for the responses. @Dana, I will give it a try.
Niral
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You are always welcome!
Dana.