On 5/17/07, Herbert Graf wrote: > On Thu, 2007-05-17 at 21:56 +0100, peter green wrote: > > > Or at least find out why this doesn't work. Anyone know? > > my first thought would be that the ground of the low voltage supply is somehow (possiblly via a peice of test or programming equipment) connected to mains ground. > > That would also be my guess. If you've got say the ICD2 connected to > your PIC, and that's connected to your PC, which connects it's local > ground to earth ground, magic smoke is the result. > > If you are using a laptop perhaps the power adapter for the laptop > grounds the negative rail? Actually I've disconnected everything now, I'm testing with just the parts in the circuit I attached and it doesn't work. (I already burned the computers COM port, luckily I also have a usb-rs232 adapter). -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist