Yeah that was where I started with the idea and then decided to see if I could dope some silicon to make a diode then move up to transistor level, then a simple

Yeah that was where I started with the idea and then decided to see if I could dope some silicon to make a diode then move up to transistor level, then a simple IC. You could knock up a point contact diode or even transistor without too much pain but that's not as much fun :) There's info on how to make point contact devices in here: http://www.qrparci.org/wa0itp/csts_book.pdf http://www.qrparci.org/wa0itp/csts_book.pdf