Dear Audioguru, You were right when u said that the voltages are missing. I'm using DC power supply. I can't seperate the positive voltage and the negative voltage. From the DC male jack to the female jack, with a multimeter, i can get both the +ve and -ve voltage. But once i connect the two ends [the end that connects to com port on multimeter], the voltages reduced to 0.2volts. Why is that so? Pls help. Thanx. p/s sorry for troubling u this few daes. =)