The "fleabay" battery charger example referred to would be a transformer type. I agree that everything nowadays (current new production stuff) is all switch-mode stuff either using buck or boost types of regulation to derive the D.C. output voltage (with the unavoidable R.F. noise they inherently generate).


Tom (PK)

I just went through this same problem, with the lines as shown on the photos, which were slowly getting worse weekly.
It turned out that the problem was the Magnavox DTV converter box. I replaced it with another identical unit and the problem vanished.