I found one of those 30 in 1 kits a few years ago from RS at a garage sale for $2. It had the parts mounted inside little clear plastic cubes that popped into place. They had open bottoms to help them fit into the board/frame better. I made a little AM transmitter that broadcast all the way down to the LW aviation beacon band! Whoops! I thought I was on 1590, and I was. I was also clear on 290 as well. Two double A batteries so let's hope it was just a house-wide thing with the little antenna I had.