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Message: <blockquote data-quote="mcraenz" data-source="post: 368284" data-attributes="member: 54136">Hey, you should be best to google around, you should find plenty of diagrams. If you use a solid state relay then it is very easy. If you use a mechanical relay it's a bit harder because you need to create a "driver" circuit  because the parallel port doesn't have enough power to run a mechanical relay on it's own. Solid state relays are more expensive though. I built <a href="http://blog.rhysgoodwin.com/2008/06/06/print-server-power-control-hack/" target="_blank">this unit</a>  with4 solid state relays. Just 4 relays in an old power supply box with 4 extension cables that come out. Be warned though, you are playing with deadly mains power! You need to keep everything tidy and safe! Don't electrocute your self!</blockquote>