but after all how could i sleep thinking about this non-working circuit...= =20 hector: i've tried random things from your list, and now it works: it was= =20 the output connection to the amplifier to ruin all, i guess it draws too=20 much corrent. Thanks to all you guys for your advices, i think i will need= =20 your help again soon for this thing to work, but now i can go happily back= =20 to program. thanks! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist