Good point AudioGuru. I don't see how those simulations worked unless he used negative voltage for the negative supply. I originally did that on the circuit I posted above and it worked but it was confusing so I flipped the supply around and declared its voltage to be positive. That worked, too.

Sgt Wookie posted a link to a free LTSpice simulator and I downloaded it. After tinkering I caught on. It's wysiwyg so it's pretty easy. The drawback for me is that it has no transformers and no double transistor configuration for differential pairs so drawing them looks confusing. And without xformers, it's pretty limitted.

 

Why does Jony's simulator show the negative battery connected backwards?

Because I'm lazy and I used negative voltage "-5V" for V5 voltage source.

 

The drawback for me is that it has no transformers and

For AC main analysis 50-60Hz instead transformers you can use sin voltage source. And for SMPS you use coils with K mutual coupling coefficient.

no double transistor configuration for differential pairs so drawing them looks confusing.

Confusing? Why?

You use Ctrl+R to rotate and Ctrl+E to mirror.

 

I fixed Jony's backwards negative power supply since his simulation program is too stupid to do it.
I could not bother to remove the Chicken Pox dots all over it.