Hi, I'm planning on using a mosfet with my raspberry pi to controll a circuit, using the GPIO pins which can be set to +3.3V or GND but I'm having problems with choosing the type of MOSFET I will need. I've found the data sheet for a possibility here http://www.diodes.com/datasheets/ZVP3306A.pdf But I'm confused as to why all of the figures are negative. E.g. The Gate-Source threshold voltage is -1.5V. Does this mean I cannot use it wih my raspberry pi? What does negative voltage even mean in this case? I'm not sure how you can have a negative becuase doesn't that just mean the circuit is connected In reverse? So as you can see I'm rather confused and would really appreciate it if someone could explain what the negative values for voltage (and current) mean practically. Thanks.