LISN

They very occasionally turn up on auction sites and usually go for good money. However, making your own can be easy and quick. Try googling for Keith Armstrong's EMI pages, Cherry Clough Associates. He gives construction details for a very nice unit. Also recommended: add a Common Mode Diff Mode splitter, easily made from a pulse transformer. Paul Mathews

I built one from Keith Armstrong's EMI pages, I believe it's an exact copy out of EN 6xxxxx something. Anyway, they are pretty simple and it works well enough, I cannot see any difference between it's performance and a $$$$$ commercial unit.

Barry

Thanks for the pointers. I've been googling, but havent found the relevant bits yet (and my f*****g internet connection is playing up again). Do you have a link?

Cheers Terry

Doh! how about:

http://64.70.157.146/pdf/EMCTestingPart1.pdf : : : http://64.70.157.146/pdf/EMCTestingPart7.pdf

Thanks once more.

Cheers Terry

Right, thats the DIY LISN built then. 30m of 4mm^2 wire cost twice as much as the steel enclosure, which I bought from RS!

and FWIW I'm not making a DIY CM & DM splitter - I will use a couple of combiners/splitters from minicircuits:

ZMSC-2-2 0 degrees ZMSCJ-2-2 180 degrees

much better response, and they are about US$60 each.

thanks once more for the link.

Cheers Terry

For DM/CM splitter, the first time, I used same Minicircuits modules you identified. Very good. 2nd time around, I used the equivalent Minicircuits circuit board mount modules. Same performance at about

1/3 the cost. Third time, I used a Pulse Engrg gate drive transformer: slightly better performance at 1/6th the cost. Paul Mathews

--snip

If you get stuck, I have all the Cherry Clough articles on a DVD from one of their seminars. I can email you the article.

---snip

Aha, Interesting, what was the part no of the PE transfomer you used?

Barry

P0584:

Paul Mathews

Hi Terry- Can you send me the construction articles ? joe.fischer@dometicdotcom

Welcome to Usenet (not Google Groups).

That post was from 2007. Terry hasn't been active on sci.electronics.design in about that long, and he said at the time that he didn't want to build one, so I suspect he wouldn't have schematics anyway.

There's another thread from April 2009 with a link to schematics. It isn't a beginner's project, though--you can easily kill yourself.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

Terry and I were both involved in a project with a New Zealand/Hong Kong company... Terry on power supplies and I on a control system chip. I lost track of him late 2011, early 2012 when his wife died from breast cancer... he was quite (understandably) broken up :-(

I don't know if he still lurks here or not. ...Jim Thompson

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