> And, IIRC, peak-to-peak voltage on the sign > wave is ~ 2.828 times the Erms. Yes, and that's why mains voltage is so lethal. For those of you who live in 117 V AC regions, the voltage that could appear across the body to ground is about 330 V pk-pk, and for those of us in 240 V regions it's a whopping 678 V pk-pk. 73 de Neil ZL1ANM