The source is grounded, and the gate is attached to {HEAD ~ the drain} or to {TAIL ~ the source} 
The source is grounded , and the gate is attached to { HEAD ~ the drain } or to { TAIL ~ the source }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL