On Wed, 6 Oct 1999 10:31:11 -0400 Wagner Lipnharski writes: > This is used in *all* magnetic tape recorders, from $5 units from > KMart, > answering machines, up to professional expensive players. The very cheapest units at least used to use "DC bias" for recording. I think this involves just flowing some DC through the record / play head (obviously causing a problem later during playback, when it is still magnetized). DC can also be used for erasing. The erase head may just be a permanent magnet. It is possible to make a recognizeable recording this way, but quality is poor. ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.