Firstly I am a complete noob when it comes to electronics, yet I am currently a Com Sci student(1st Year). I am currently building this project with the arduino; http://www.glacialwanderer.com/hobbyrobotics/?p=11. But because I came from a rural area and only going back to university in a few weeks I've substituted the optoisolator with a transistor. The circuit works with an LED in place of a flash, however when trying to trigger the flash nothing happens, I am not sure if I can narrow this down to A) Not enough power to the flash. B) Connected the wires at the wrong points (IE, the two points that touch to trigger the flash, however these points are not soldered). Any advice would be appreciated.