Andre Majorel wrote: > That's from http://xkcd.com/730/ Yes indeed. He does seem to have a very good sense of humour. > The AD639 transfer function at 41:19 looks like it would make a > good wave shaper. Yes it does, doesn't it. And the core schematic looks relatively simple. Shame they EOLed it :( Neil -- http://www.njohnson.co.uk