Ah, high voltage work!

Put the isolation transformer on the project.  Treat the project as hot.

Here's the reason:
Your laptop is in contact with other items that are grounded,
regardless of the isolation transformer.  For instance, you.  Other
items might be printers, USB devices, etc.  Even if you isolate the
other devices, good luck isolating yourself.

You must treat the project as though every point on it is hot - when
it's connected to the programmer you are still forcing a ground on it,
and all the other points, depending on the design, may be hot.

Good luck!

-Adam

On 5/17/07, jim ruxton <cinetron@passport.ca> wrote:
> 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
>
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