Dear all,
I want to let you know, that all people who wrote to me, were right:
the 100 Hz-modulation was due to the 10.000 µF electrolytic capacitors of
the power module.
Replacing them solved the problem.
Thank you again.
Yours
Matthias Findesien
Received on Thu Jun 19 2014 - 03:17:47 MST