[jyl]

So does the polarity of V(GS) matter? I noticed that the original circuit I got off the web had negative (ground) connected to the source, while you guys are connecting positive to the source.

And, okay, I'm now reading that V(GD) matters, if it is in a certain range relative to V(GS) then the MOSFET is not truly "ON", it is in something called "triode" mode and the I(D) curve is sloped not flat. I found a cool little Java applet that helped me see this. I think that is what you guys are saying.

SPICE looks cool. I will try to learn it. Looking for a Mac-friendly version, ideally w/ a graphical or browser front end. My only PCs are work machines and they are locked down, can't install software.

I took a circuit design class in college (decades ago). Wow, there was no SPICE back then. Pencils and calculators.