(2015-06-27, 17:41)Steph Wrote: Isolation transformers can (depending on type) transduce several 100kHz, so this probably won't work very well and is expensive.
I'd recommend putting a choke between the PSU and the controller. Make as much as possible windings on a Epcos T37 ring core, or N30. This will help, if the noise is coming from the power line.
I made some measurements on that:
But as i said earlier, a clean grounding is most important for e-field. Vertical ground rods don't work well, because the current is seperating at earth surface due skin effect, leaving a big ground resistance.
Ideally large expanses of vertical wires just below earth surface are used. the more and the longer, the better.
But a direct wire to the water supply pipe will be enough for our purpose in most cases, as long the pipe is of metal and not PVC.
that's a nice setup only this is not possible here
I don't live free
and thanks for the info .... choke will keep it in mind
my ground is coming from my second grounding punt
not in this house but this one is outside no powerline on this one
ground from water pipe not possible its PVC