Oscillators

Today I built up a quick little oscillator.The source is here: http://www.play-hookey.com/analog/generators/triangle_waveform_generator.htmlOnce I got the split supply set up (and not just assume that ground is the negative rail) it oscillated!  :-D  Well, it wasn't really either a square wave or a triangle wave, but it was something that was wiggling about at around 13kHz.Ok... well the op amp I used seemed to be a bit slow when recovering from saturation so it wasn't really either a square wave or a triangle wave... But I have a faster one on order.It's like anything. Diving in is something that I need to do to to learn shit. It's just the way I manage to pick things up.