Just for fun I pulled a stereo amp out of an old computer, one of those TEA jobs that run from 3vdc to 12. I hooked up a little dollar store FM radio (TEA 7088T)to it and everything works great as long as each circuit gets its own battery. As soon as the battery is shared, nothing happens. I thought it was a current prob @ first because I was using tiny batteries, but after hooking up a pair of D cells, I decided current wasn't the issue. Anyone have any ideas?