Hi, Could you please say which Microchip App is that ? I=B4m trying to solve a problem that is very similar to your problem. I need to know when ANY kind of load is connected to the power line, so I turn on an external power inverter. (12DC to 127AC) A very small inverter 1W, connected to the line was my first idea. When it senses a drain of more current, it turns on the big generator. Any suggestion is welcome. Thanks ! Rubens >2) I could use the technique discussed in the Microchip App. note = >concerning AC interfacing. The problem with this is that I want to be = >able to detect the bulb without having to turn it on. I could flow low = >current through it but that would change the component values and cause = >problems when the bulb is actually turned on with full current. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist