I have an audio-band piezoelectric transducer with a 17 kHz resonant frequency (among others). I'd like to use this transducer to acquire from an MCU an FSK modulated audio signal.
When I plug the transducer into the oscilloscope (with a 1 MOhms input impedance) and I observe the FFT of the voltage produced by the transducer, I observe a peak, with an amplitude of ~100 microvolts.
This amplitude is obviously too low for the ADC of the MCU, so I'd like to amplify the signal, but I don't have any idea how to do it.
How would you recommend to do that? For any purpose, transducer capacitance is supposed to be 13 nF at 120 Hz, according to the datasheet.