Re: Kiloamps induce currents (was: Economizer circuit)

[Bill Dube <billdube@killacycle.com>]

>The unpowered transistor's heatsink got almost as hot as it did when
>powered; the transistor and heatsink away from the core was much cooler.
>Cause? Leakage flux from the core saw the heatsink as a shorted turn,
>which got hot.

	An simpler cure might have been to "backtrack" a turn on the winding(s) on
the core. Basically, when you have put on the "last" turn, you run the wire
back they way you came, along the side of the torrid, so that it comes off
right next to the other lead. Thus, you cancel the single loop you
effectively made as you wound the torrid. You can also space your turns and
make a second "backtrack" layer instead. This works even better.

	Once you get rid of the loop, you get rid of 99% of the radiated flux.
This also greatly reduces the RFI and the need for RFI shielding on the
final product.

Bill "Wisenheimer" Dube'  billdube@killacycle.com
check my website at:
http://www.killacycle.com