Hi there, I have been trying to find a design for a small circuit similar to the one they use on the Cat Scat Mat as seen on eBay, I am having heaps of problem's with stray cats in my yard and I wish to make a couple of these circuits. The mat should not be a problem, I'm thinking I would use heavy plastic sheeting and using a 6mm wide copper tape that is used in lead lighting I can make the grid. I am hoping you have such a diagram, Please.