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Hi,To those who built this digital ac line filter design by John Risch, any feedback WRT reducing digital noise interaction? When digital front end plugged into it does it preserve the 'dynamics' of music? Thank you.
fred
Follow Ups:
I've been using JR's digital filter made of 2 back to back trannies with caps, Rs and R-Cs in between them on the secondaries. Works great in my system. No loss of dynamics at all. Got the desired improvement in clarity. So I"m a satisfied customer.Difference from his original design is that I use larger trannies, so I carry more current through the filter. Also use a wider array of stuff between them than the original design - nothing that isn't already noted here in the archives from discussions that I'm aware of, though, so no magic formula.
I didn't use a metal box (aluminum prefered - skip any ferrous stuff!), nor did I shield the PC. Both may have improved the design and results, so be aware of that if you make one.
Also, unless you use a fairly large set of trannies, you are NOT going to plug in more than one device - your CDP - as you then WILL limit dynamics quite noticably. These don't transfer enough current for 2 devices (say like adding your DAC) at all.
Hi bartc,Thank you for your feedback and advice... I would do a search for the passive circuit "additions" you mentioned in-between the secondaries.
YOu will probably find it under headings or keywords that relate directly to Jon Risch, his name and his filter design.
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