hi,

thanks for the quick reply. that works, i tried connecting it to a 5V supply and the buzzer worked. however, i cannot get it to work with my 8051 chip (actualy the P89c51rd2)

what im doing is, connecting the ground pin to ground and the supply pin to port 2, pin 0 (ie, P0) and then, using the C code:

#include <reg51.h>
sbit d = P2^0;
void main() {
d = 1;
}

and i even tested the wire and found that i did have 5V where it should be. but the buzzer doesnt work, it only works when i connect it directly to a power supply. maybe my current is too little out of port 2, pin 0? i dont know. any suggestions?

thanks