Re: [CAD_CAM_EDM_DRO] Motor Noise?

Hello Alan,
Thank you for the link, but it seems to me that I will first
have to find out about the theory of blocking RF signals (1,3 to 1,5MHz
and its harmonics) from the 60Hz lines (120V 10mA switched input for
mini-PLC) I have to protect.
This link is for me in chinese, I don't understand a bit from it!

I remember in the radio and RF-amplifier factory I worked for that to block of
a picked up signal you simply passed the wire some 2 or 3 times through
a small bead that had several holes in it.
Can't that be a simple piece of iron you drill in the holes?
Or must it be the sintered stuff?
Thanks for any response
Sven Peter

Alan Marconett KM6VV wrote:

> Hi Sven,
>
> Try Amidon, who makes them, or a distributor:
>
> http://www.bytemark.com/amidon/content1.htm
>
> My local "Halted Specialties Company" (HSC) in Sunnyvale, CA has a
> selection of them. Also check at "ham" supply houses. Digikey?
>
> Alan KM6VV
>
> "Sven Peter, TAD S.A." wrote:
> >
> > Where can you get ferrite beads or how can you make them.
> > I have an application where I fear to get 1,5 MHz radiation into
> > the mini PLC. I haven't seen ferrite beads for years and have no
> > supplier for them. (asked already all local electric and electronic suppliers)
> > Any answer is very appreciated.
> > Thanks
> > Sven Peter
> >
> > Alan Marconett KM6VV wrote:
> >
> > > Hi Phil,
> > >
> > > You might try some of the "clamp-on" ferrite cores used for computer
> > > cables. At the speed control, at the computer parallel port cable, at
> > > the driver, etc.
> > >
> > > Alan KM6VV
> >

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