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Old 24th Aug 2018, 2:05 pm   #13
Philips210
Nonode
 
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,562
Default Re: Long Wave interference problem solved.

Quote:
Originally Posted by David G4EBT View Post
A couple of homebrew designs here, which might be of interest - one more complex than the other:

http://www.dms-audio.com/sites/defau...ins-filter.pdf

http://www.decdun.me.uk/mainsconditioner.html
Hi David

Thanks for the links for the mains conditioner projects. When I can find the time, I'd like to build the ETI circuit as per your second link which looks a very comprehensive conditioner.
When I contemplate building such a project, which usually takes me many months to get aroud to, I always like to find the difficult parts in advance. In this case the the Ferroxcube toroid and the varistors or VDRs. I noticed CPC stock a couple of likely substitutes for the varistors, https://cpc.farnell.com/epcos/b72207...75?st=Varistor and https://cpc.farnell.com/epcos/b72210...86?st=Varistor and wondered if these would be suitable? Maybe use 3 of each rather than 6 of one type?

Regarding the FX 4054 Ferroxcube toroids, I checked in my 1988 Mullard Quick Reference Guide and it describes this nylon coated toroid as grade 3E2 (blue), dimensions 23 x 14 x 7mm. Finding a suitable alternative is proving a little difficult though it's probably not that critical. Any suggestions for a suitable toroid for this project?

Regards
Symon
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