It's actually quite a simple circuit, and not really as complicated as it looks, I think that's probably because of the power supply circuit, I'll do a write-up about how the circuit works soon.
I tried to find a circuit diagram that would let the viewer zoom in but the one I posted was the best I could do at the time, perhaps if I do a hand-drawn version and scan it into my computer, that may sort out the zooming in, I'll get that sorted out soon.