I just want to thank all three of you for renewing my desire to see what makes the black box tick. Actually I have been in sort of a burnout mode for the last 6 months with electronics, but since coming upon this forum and others I have been renewed and am getting back that desire to explore and go beyond the next IC. P.I. detectors are so interesting and fun to learn about. I have never had a P.I. detector but hope to play around with a P.I. project. The best to all you guys from Texas! Wirechief.