First of all, thank you very much for everyone's replies. Actually, this is not a 'vanilla' buzzer im using here. What i did is, i bought a very cheap battery operated (3x1.5V cells) magnetic switch alarm module that operates to detect if there's an opening door/windows. I strip off the alarm module because i wanted to use the built-in very loud buzzer cicuit

Before venturing ahead with this, you need to do two things.
1) connect the 3x1.5V cells through an ammeter and post the amperage
2) connect the the 3x1.5V cells through an inductor and measure across the buzzer with a scope to see which kind of spikes there is

Erik