[SOLVED] Peizo electric buzzer drive circuit

[knikhil271083]

Hi,

I have bought a peizo electric buzzer PS1740P02E from TDK. Its freq is 4KHz.

I want to test this buzzer for its sound quality before placing it on the circuit board.

I connected a 1K resistor across it and gave it 3V and GND without using the transistor drive circuit as shown in the datasheet.





The problem is that, when I apply 3V to the circuit, I do not hear any sound from the buzzer.

Later, after going through the datasheet thoroughly, I found one line in 'precautions' as "Do not apply DC bias to the piezoelectric buzzer; otherwise insulation resistance may become low and affect the
performance."

Am i giving this DC bias to the buzzer due to which it is not working?

Do I need to use the buzzer drive circuit and give 4KHz waveforms to its input to hear the sound?

Regards
Nikhil

 

[Jestin_cubetech]

buzzer circuit

Peizo buzzer using NAND Gate

 

[knikhil271083]

Thanks for the buzzer circuit.

I would like to know whether the second figure that I have posted should work or not.

 

[Jestin_cubetech]

no.

try this

 

[knikhil271083]

no.

try this

Thanks a lot. Will try and let you know.

 

[knikhil271083]

no.

try this

This circuit worked.
I generated 4KHz from a controller pin (@3.3V) and fed it to the transistor input.
Initially the buzzer sound was very low.
But when I removed the resistor across the buzzer, the sound intensity increased.

Can anybody tell me why. Datasheet says it is for charging/discharging of the peizo-electric buzzer.

As far as I know, the peizo electric element will generate pulses (sound pulses in this case) as long as it resonates at ots resonant frequency.

Any light on this matter will be appreciated.