Quote Originally Posted by bengel
Hi,

I know this thread is a little stale but I thought I would take a shot...

I am about to build a balanced power supply. Basically it is only going to power digital stuff like my preamp, dvd/blu ray etc.... plus my TV (which I guess is analog). My amplifer will not be plugged into this.

My plan is use the EMI/RF filter designed by Jon Risch however I cannot not seem to find a good answer as to where to place the filter. Either before ON the primary or after on the secondary.

From the article at Equitech, having filters on the seconday seems to be "required" as it provides a pathway for reactive currents to flow to ground.
http://www.equitech.com/articles/origin.html (see figure 2)

I read other places to put it before - on the primary and just wire the secondary taps "directly" to the outlets.

Then I read Jon Risch saying do a hybrid.... which puts the inductors and 1 bypass (across both 60 hot wires). http://db.audioasylum.com/cgi/m.mpl?...rmer+Jon+Risch

I have uploaded my schematic drawing of the Jon Risch filter that is on the primary.
http://forums.audioreview.com/attach...1&d=1268107554

Just wondering if anyone could offer any clarification on this. The equitech diagram (figure 2) makes the most sense to me as it is providing a pathway for reactive (noise) currents to ground.

Thanks!
Welcome to AR Forums, Bengel.

Sorry, I don't think I answer your question, (but see below). I think you might do better with such questions over at DIYaudio where there are more technophiles than around here.

Maybe my eyes (or brain) misleads me but in JR's Audio Asylum reference it almost looks like the PS there is not a balanced supply: the outputs are labeled "H" and "N", not "+" and "-" as you would expect from a balanced supply -- of course it might just be a typo. However that being the case, I wouldn't risk putting a capacitor across the + and - taps on balanced supply.

Thanks for the schematic you supplied which is very interesting. It's tempting to me to consider such a project in the future.