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]

You can increase the duty cycle (which will increase the average voltage), or you can increase the supply voltage. Do what is easiest for you. The average voltage will determine the loudness: loudness = supply voltage * duty cycle.

[MARTIN FR]

Non i cannot use transistor because am usinng negative terminal of the buzzzer conencted to antenna so i want to use these two pins 6 and 7connected together to buzzer positive terminal so the maximum current of one gpio pins 5mA so the buzzer positive terminal wiill receive maximum upto 10mA in that way i can able to increase the sound of the buzzer

note: i think inside the nordic chip iteslf there is a transistor right?

please let me know if i am wrong in my concept