Whats the diff? JFET and MOSFET?

[888guitars]

what is the difference of a Jfet from a mosfet?

[Koreth]

JFET stands for Junction Field Effect Transistor. There's a semiconductor material that forms a conductive channel between it's ends, the source and drain. There is a single junction of another type semiconductor material. Putting a voltage on this junction (the gate) pinches the conductive channel shut. Because of a its construction, voltage at the gate can only turn a JFET off, much how a tube behaves.

MOSFET stands for Metal-Oxide Semiconductor Field Effect Transistor. MOSFETs have an insulative layer of metal oxide between the gate and the rest of the transistor. Because the gate is isolated from the rest of the device, MOSFETs can be constructed so that you have to apply voltage to them turn them on and get them to conduct.

There's advantages and disadvantages to each type of construction and electrical behavior, depending on how you want to use one in a a circuit.

[888guitars]

Ok so they are not really interchangeable then. Thanks for the explanation.

[Enzo]

No not interchangable.