FB - that explains the semi-circular arrow between the two inductors on the schematic - I wasn't familiar with the notation. I don't know the whys and wherefores, so I just picked the most elaborate of the several filters they showed on the catalog page - as I recall, it cost around $10 plus shipping, so I got two while I was at it.
73, Pete N4ZR The World Contest Station Database, at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 and arcluster.reversebeacon.net, port 7000 On 7/4/2012 3:41 PM, Paul Christensen wrote: >> According to the schematic on the side, it consists of 2 x 2.5 >> mH indutors, one in series with each leg, a 2200 pF cap shunting the >> line input and 0.1uF capacitors from each leg to ground on the load >> side. > It's generally two inductors wound on a single core for common-mode choking. > The result is that total common-mode inductance is 2*L while > differential-mode inductance cancels and equals zero. The 2200pF caps are > differential-mode shunts to ground. Some of these modules can be purchased > with complex combinations of both common-mode and differential-mode > inductance and capacitance sections. I use them for almost all home-brewed > projects that require an AC supply. > > Paul, W9AC > > > > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK