I have noticed that you folks usually don't come right out and answer a question. Instead, you give just enough information to get the questioner on the right track and, if the questioner applies himself, he can figure out what he wants to know. I have been trying to learn about this stuff for a while now. I'm a 60+ retired industrial mechanic and, for me, low voltage is 120vac and low current is 15A fuses. High voltage is 2500-4160 vac and high current can be anything from 500A to 10,000A. Having said all of that, I want to thank all of you for forceing me to think this stuff through. Because of you I don't break out in a cold sweat when i have to do something with a 555 timer. I have even designed simple circuits using 4093s, 4017s, and 4015s. I plan to learn how to work with PICs, but that is down the road a little. Since I only have two active brain cells --and one of them is always on vacation-- I take it kinda slow. Thanks again, and keep up the excellent work.