Hi If you look at some of the wire that they use, the rating may be as much a wire rating as a core rating. They use *small* wire !!!
I’ve always assumed that if you go over 30 ma anywhere on any winding you are in trouble. I suspect that DC through the entire winding (ignoring the center tap) is a “legal” thing to do. Bob > On Nov 26, 2014, at 6:39 PM, Charles Steinmetz <csteinm...@yandex.com> wrote: > > Dave wrote: > >> The magnetic field in the core due to the current in the windings is >> proportional to current times number of turns. If there are more than one >> winding, add the currents. Yes, 2 x 20mA certainly exceeds 30mA. The core >> will be driven closer or into saturation and the inductance will be >> decreased. > > Right, that's how you calculate ampere-turns. But the question is, when MCL > says "DC: 30mA" with no elaboration, does that mean 30mA through one winding, > 30mA in the same direction through two windings, or 30mA in the same > direction through all three windings? (Whereas, 30mA through one winding and > 30mA through another equal winding in the *opposite* direction creates no net > magnetic field because the flux cancels. This is the case, for example, if > two windings are used as a CT primary for a push-pull amplifier with Vcc > applied to the CT. "No net field" presupposes perfect matching -- in > practice, there will be some residual imbalance.) > > Best regards, > > Charles > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
