Using a good current source with a zener diode can help improve stability tremendously, (for every circuit, about 13mA seems pretty good with the default settings at 5.1v). Because perfect current sources don't exist like they do in EC, if your using transistors; biasing a PNP with a zener diode at: Vcc-1.5v, works really well and keeps it stable with just a few components. There's no load on this circuit yet, but I'll make some updates later, and see how it does with a load using just 1 or 2 more transistors as a buffer... from there, I'll see if it still needs more improvements.
