Mon May 21 16:24:16 CEST 2007
very strange: if i touch the table, the pic resets. some kind of EM
interference. i don't really know what's going on, but putting the
stamp in a cage worked: just a grounded metal top of a metal box.
if i stick the probe in the carpet, i can measure about 25 V
peak-to-peak 50Hz signal. maybe i should just ground my table?
ok, i connected the TV cable shield plugged into the cable modem to
the case of zzz. without this cable there's 114V ac accross. this
seems to fix the problem: no more 50Hz on the carpet.