My guess would be you have a groundloop. If you can run either the computer or the powersupply of the target without ground your probably disappears Peter van Hoof ----- Original Message ---- From: Philip Pemberton To: Microcontroller discussion list - Public. Sent: Thursday, June 22, 2006 6:33:22 AM Subject: Re: [EE]: ICD2 introducing noise onto +5V line Wouter van Ooijen wrote: > I would guess this noise originates from the PCs +5V supply, which is > probably the direct source of the USB +5V. Have you tried > > - using the ICD2 without powering the target from the ICD2 I probably should have mentioned that the target has its own power supply. It's coming from a Farnell Instruments L30B bench PSU. Not the best power supply in the world, but it gets the job done. > - a powered USB hub between the PC and the ICD2 I don't have any spare powered USB hubs :( Thanks. -- Phil. | Kitsune: Acorn RiscPC SA202 64M+6G ViewFinder philpem@dsl.pipex.com | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+100G http://www.philpem.me.uk/ | Tiger: Toshiba SatPro4600 Celeron700 256M+40G -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist