Joule Thief Made With A Ferrite Bead From An Old CFL Light Bulb

Here I make use of an old burnt out CFL light bulb for a Joule Thief light circuit. The ferrite bead/core from the CFL is at most 1/4 inch diameter and can fit in the core of my last circuit with a bit of room to spare. I used about 22 turns of fine (b