Testing the fastech piezo

I made some test with an attiny13a and the piezo I bought from fasttech : the good new is that the piezo are easy to solder, and worked on first try. The sad thing is that sound is not really loud. It is better to run the mCU at 5V than at 3.3, but cheap cell coins does not come in 5V...

I started to thing about how to handle a 4 tones polyphonic sound generation for a keyboard that can start 14 different notes... I guess I will have to use 4 piezo, or use resistors and a voltage divider to simulate an analog output.

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ftregan wrote 12/03/2014 at 21:50

Thank you for the hint. I have other more important project I want to finish before this piano, but I'll a try to the 100r resistor, thank you ! (though I really don't understand how it should improve things from a current flow point of view)

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Masoud Gheysari wrote 11/14/2014 at 21:22

OK. This post is 5 months old and I don't know if you still work on this project or not, and if this is helpful for you. But try to connect a 100 ohms resistor in parallel with your piezo speaker. It will boost its sound 3-4 times. I had the similar problem with the wrist watch I was trying build and doing this gave me a great sound power output. That's because the piezo itself doesn't sink much current. So, connecting a parallel resistor will flow the current in the circuit and so in the piezo, and your sound will have more power.
I really like to see your completed project. Please keep us posted. Good luck.

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Piezo discs

Cheap wire found

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