On 17 Mar 2003, at 10:28, QAC wrote: > I think it's clear that I need a isolation transformer. > It also looks like it would be best to connect the IT > between the mains and the device under test, not to the > scope, right ? Absolutely. > Now, my device under test is realy low power. > So, would it be possible to put together something > inexpensive either with some ready made (smaller) > transformar, or buy handwinding something ? > Any design tips ? Used to be that we could do this for low power with a couple of 6.3v heater transformers wired back to back. But you could do the same for your light load with a pair of any transformers. (Pull a couple of cheap wall warts apart). George Smith -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu