jfet strangness NEED HELP Answered
I just got some npn jfet transistors in the mail and I'm having problems. My setup is a +5.5 volt, gnd, -5.5 volt powersupply. I hooked up the LED to a resistor and going through the drain and source to the +5.5 volt and gnd so the LED lights up. Whenever I apply the negative voltage to the gate the transistor should turn off, right? well whenever I do nothing happends. When I touch the gate with my finger the LED turns on (no current) so the LED turns off. Sometimes when I touch it again it turns off (LED on). sometimes it just turns off when I touch it. When I touch a grounded (real ground, for like anti static stuff) aligator clip it does the same as my body. When I touch the -5.5 volt with one hand and touch the gate with the other nothing happends. Sometimes by how far away my finger to the gate the LED goes up and down in brightness. My questions is how can I turn the transistor on (so that the LED turns off) when I apply a voltage to the gate?