Hi, I'm working on a project which has a transformerless mains powered supply. I want to debug it with the ICD-2. I don't have an opto-isolated USB hub but I do have an isolation transformer. Would it would ok if I put the isolation transformer on my labtop (which the ICD-2 is connected to via. USB) and power the circuit I'm working on with mains or alternately use the isolation transformer on the circuit I am working on and plug the laptop in directly. Thanks, Jim -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist