i had a thought to stick two diodes together such that the electronic setup was similar to that of a BJT transistor. however i have been told by multiple teachers/professors that the two were not equivalent. I have drawn a picture to show you what i mean. the top two pictures are just the circuit setups. the bottom two pictures are the physical electronic setup that is being represented. Please explain why these are not electrically equivalent. http://i.imgur.com/6ssocN3.png so basically my rationale was, that since a conductor is supposed to carry charge, ie, where ever there is an excess of charge, there becomes a potential difference and thereby allows the charge to travel through the conductor. so whenever one of the P material has an excess or a defficiency of charge, it will get transferred over to the other P type material in the other diode. and.. it gets transferred over through a conductor which of course can be tapped, thereby able to be turned into a BJT transistor setup.