I feel like I am spamming this newsgroup. As for the gun, i'll wait a few days defore i do some more reading on it. I want to charge a battery from a 15V DC supply. but I want to control the on /off charging by a transistor(NPN). At first the collector connected to the power supply, and emitter to the battery. Although the Vbe should be about 0.7, giving me about 11v to 14v on the base. I wanted to control that base using a 555 timer, but the output of it is 6v, Would the best strategy be to use another beter the timer and the charging transistor ? I was also thinking of using a SCR instead. Would there be a semi conductor that could have the shape of a transistor, but as soon you open the base it would creat a current flow from collector to emitter until no potential is seen AND no Vbe to consider. ?