Thanks Ron.....will go to HD and ask for some advice.
My smokes are the hard-wired type.....just wondering if they are on a "normal" breaker on my panel in the garage.?
I do not have any kind of alarm service at my house, so there should be no problem with me disabling them to install new ones.
I guess what I am (finally) asking is....do the smokes run off of some type of low voltage...maybe there is a transformer and rectifier some place in the house...or is there a rectifier circuit in the smoke detector.?
Just wondering what type to buy.....I suppose Home Depot can advise in that arena also.......
Thanks Again