Maybe

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Maybe

Posted by bartc (A) on April 27, 2007 at 05:33:52

In Reply to: Chokes: toroids versus EI cores for AC power line noise filtration posted by Christopher Witmer on April 26, 2007 at 22:04:06:

Al Sekela guided me through these and other transformer based AC filtering tweaks. He gave me an explanation that seemed to favor EI cores vs. torroid. Best I can paraphrase is that toroids may be too efficient at passing stuff through, while EIs have a greater filtering effect (paradoxically because they are not as efficient) somehow. Ask Al.

Meantime, I use EIs in 2 filtering devices: a Jon Risch Iso Tranny for my digitals, and a transformer based parallel filter elsewhere.

Al has been guiding me through the use of BOTH chokes and transformers, as well as R-C filtering since this stuff was first posted on this board. Look up his previous posts and drop him a line for a good explanation. He's doing more choke experimentation right now.

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Follow Ups Full Thread

Topic - Chokes: toroids versus EI cores for AC power line noise filtration - Christopher Witmer 22:04:06 04/26/07 (13)

What you want is lossy core behavior. - Al Sekela 16:28:54 04/27/07 (9)

Re: What you want is lossy core behavior. - rick_m 23:47:26 04/27/07 (0)

I'm thinking I might need to rolll my own - Christopher Witmer 19:51:46 04/27/07 (7)

Yes. You will need to connect an R-C network to the secondary. - Al Sekela 22:05:03 04/27/07 (6)

One more Q - are the effects the same? - Christopher Witmer 05:40:42 04/28/07 (4)

One post for your latest questions. - Al Sekela 11:46:58 04/28/07 (2)

Little Grasshopper is thus enlightened - Christopher Witmer 13:59:25 04/28/07 (1)

EM field theory has been a tough subject - Al Sekela 17:34:48 04/28/07 (0)

Re: One more Q - are the effects the same? - bartc 05:47:33 04/28/07 (0)

I'm a bit confused - "characteristic impedance"? - Christopher Witmer 01:33:13 04/28/07 (0)

Maybe - bartc 05:33:52 04/27/07 (1)

Maybe not - Pooge 09:53:06 04/27/07 (0)

Re: Chokes: toroids versus EI cores for AC power line noise filtration - audionutge@yahoo.com 01:38:39 04/27/07 (0)

Follow Ups

Maybe - bartc 05:33:52 04/27/07 (1)

Maybe not - Pooge 09:53:06 04/27/07 (0)

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