but the piezoelectric ceramic chip directly connected to the signal generator, but can not send out the ultrasonic wave, is it necessary to drive the circuit?Where can I buy the drive circuit?
1, the human ear can feel the sound frequency range is 20Hz-20kHz, ultrasonic exceeds this frequency, even if the ultrasonic wave, you also can not hear
2, you use the signal generator to drive piezoelectric ceramic, in the audio range is able to make sounds, such as 500Hz sound is easier to hear
3, some piezoelectric ceramic is high pressure, at this time the signal generator drive voltage is not enough
