FET Transistors

[gstopp at fibermux.com]

     You know that's a good question. My typical answer (an unprofessional 
     one, I know) is "move it around till it works".:)
     
     I would offer an answer to this one if I could, but I'm weak on the 
     theory behind the various junctions and such. It would be nice if 
     somebody with such knowledge could post a long description of 
     transistor physics. Like - okay what's the real difference between an 
     emitter and a collector in a transistor? In an NPN they're both "N" 
     with a "P" between them, but you can't swap them in a circuit. Why 
     not? Similarly, what's the difference between a Source and a Drain in 
     a FET? Such a post would be great archive/FAQ material.
     
     - Gene


______________________________ Reply Separator _________________________________
Subject: FET Transistors
Author:  Bob Zimmer <bzimmer at voicenet.com> at ccrelayout
Date:    12/16/96 12:48 PM


The discussion that went on the other week about FET's and pinouts, leaves 
me wondering if there is a way of determining the pinout of a transistor 
such as a 2n4391 or MPF102 without having a datasheet.  I had found a way in 
Electronotes of determining the pinout of a small signal NPN or PNP 
transistor and am wondering if anything similar can be done for FET's with a 
simple circuit.
     
Bob
     
  >=== Bob Zimmer -- Philadelphia PA ===< 
  >=== bzimmer at voicenet.com          ===<