On Monday, May 31, 2004, at 21:53 US/Pacific, Charles Craft wrote:

>
> http://www.emanator.demon.co.uk/bigclive/joule.htm
>
A neat circuit...

> Picked up some ferrite beads over the weekend but the center hole
> isn't  large enough.

Better to find some different beads, probably.   You'll have better
luck with things labeled as miniature torroids.  Too many "beads" have
little or no I.D...   Or maybe something else ferrite-ish.  I had luck
with a number of shapes, including those little bobbins power inductors
are wound on.  Best off-the-shelf performance was from the filter
transformers (of several types) in switching power supplies; they
already have the two equal-turns windings.  the inductance is quite
high compared to Clive's circuit, but not high enough to make any
flicker apparent...

BillW

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