Hi All, Once I was building a regulated power supply for a plate load supply (400V @ 300mA) I put a zener diode in the wrong place, across the rail!! When I turned on the switch the zener blew up like a firecracker. Big flash of light. Unfortunately my wrist was above the zener at the time and there were little bits of plastic and silicon embedded in my skin. Some were pretty deep and took a while to come to the surface. All that was left of the zener were the two wires. After this incident and many others I decided it is good to keep the glasses and not get contact lenses and never turn on anything I wired up after ten at night! Keep it safe Aleks ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com