Why not have a look at Clive Mitchell's version: his uses a single
    transistor and he includes pictures of how to use a ferrite bead to make
    the inductor.  Have a look at
    <http://www.emanator.demon.co.uk/bigclive/joule.htm>

This circuit came under discussion on the yahoo BEAM group recently, and I
did a bunch of experiments with inductors found and/or wound on all sorts of
random cores, including small ferrite toroids and filter inductors from SM
power supplies.  Look for messages with "Joule" in the header - I even
posted pictures.  (Since this "transformer" design calls for only about 20
turns (bifilar), it rather sapped by interest in homemade "simple"
inductors...)

BillW

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