"Jim Lesurf" wrote in message
...
Hi,

Just to let people know that I have just put up a couple of new pages that
explain the basics of how mains RFI filters work. The aim being to allow
readers to decide which type of filter - if any! :-) - might be most
appropriate if they have a problem with RFI.

The first page is at

http://www.audiomisc.co.uk/mains/filters1.html

and that has a link icon at the end to take you to the second page that
deals with ferrite and VDR devices and their use.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics
http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html


Jim,
I think it might also be worth mentioning that when earth referenced
filters - i.e. caps. etc. from Live and Neutral connected to Earth, that
there is a potential safety issue and that the Earth should never be
disconnected. How many old-timers have disconnected the Earth on a scope
looking to stop loops and found that the chassis floats up to half the mains
volts - albeit limited in current- but still enough to give a bit of a
tingle. IIRC, HP scopes in particular at that :-)

Happy listening

Mike