>Hey listas, > >Got a problem and need some of the electrical/computer experts out there to >help. I am a mobile DJ and use my TiBook for playing MP3 music (all legal!) >at my gigs. I also use a wireless microphone. > OK - quick summary: First you need to determine whether the interference is coming through the power lines or is being radiated. Does it get worse when the mic is nearer to the PB or power supply ? If so, it's probably radiated, if not them it's probably coming through the power lines. If it's coming through the power lines then you can try an isolating transformer and/or mains filter. It it's radiated then you've got a problem. Paul --