how to increase the buzzer loudness

[MARTIN FR]

Hello everyone ,

i am trying to increase the sound of the buzzer so can anyone suggest me do i ahve to increase the supply voltage or do i have to modify the dutycycle of the buzzer , i really dont ahve any idea how to achieve this without adding any audio amplifier circuit any suggestions or ideas will be really helpful for me to move forward

Thank you

pwm_volt.c

[Ole Bauck]

If the pins are not perfectly in sync you will risk a short circuit. The maximum current recommended from each pin is 5 mA. Can you specify what kind of buzzer/antenna you have?

[Ole Bauck]

Looks like the impedance is 1Kohm. If this is correct, the current draw will be 3.3mA if Vio is 3.3V, which is within spec. It also seems like the buzzer will beep at 9KHz if DC is applied to it, if so you dont need PWM, just set the gpio high. To get higher loudness you will need higher voltage. I am not an expert at buzzers, but this is what I understand from the buzzer specification.

Regarding using the negative of the buzzer as an antenna, I have never heard of this and it does not sound like a good idea. What is the background for doing this?