> So, he will want to have it pass Part 65 (thats telco...or is it 68?) and so there is the isolation issues, but he also wants to pull power from the telco line to run the micro and such. Part 68 > I want to squash his dreams right away rather than get down the road and then find its not going to pass. You're allowed a few microamps or so. You can also draw power when you're off-hook, or when the line is ringing, to charge up a supercap, if you can do it without upsetting the impedances. Constant current sources are your friend. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist