Weird, I noticed there were 2 schematics when I searched for it. There is one with color (the one you posted) and another that is grey. I guess on this schematic, what does VB refer to? I assume they all connect together... Is that all that VB is for?
Thanks again, still learning!
The black and white, handdrawn one is not mine-it's not the same design but the effect is the same. Yes, Vb is just all connected together. The junction of the 2 100k resistors to the left on the schem create a voltage source that is half of V+. This is used to supply all of the Vb points throughout the schem.