Hello all. I have been visiting this site for a few weeks and find it extremely helpful. Now i have come to the point where I could use some help. I am in an associates program and have been given the task to build a simple dusk to dawn switch. The only requirements are that I must use a photosistor, an lm741, and a 9 volt battery. Optionally it could also be able to be fine tuned for the amount of light required to turn it off. (potentiometer maybe?) I have spent weeks on this and cannot get it to work. Any suggestions or schematics would be greatly appreciated. Thank You.