FET Transistors

[R.G. Keen]

>>Most jfets are symmetrical regions of semiconductive N or P type
>      -----
>>material, the "source" and "drain" being nominal designations of
>>the ends of the region. The gate is an abutting region of the
>>opposite type of material.
>>
...

>That is true for Junction FET's like the BF245,
>but absolutely non true for MOS-FET's like the BUZ10, BS250.
>In case of the MOS-FET there is an isolating layer between the 
>Gate and the part where drain and source are connected to.

That's why I said jfets.