Joule Thief-- with tunable coil.ASF

This is a standard Joule Thief circuit with a tunable inductor coil. The simple one transistor circuit is powered off one 1.5 volt AA battery and is driving multiple LEDs in two locations. The coil is hollow and a ferrite slug is used to adjust it's three windings into resonance. A potentiometer at the transistor base is also used to fine tune the circuit. The 27 LEDs are on a Dr. Stiffler SEC tower and are-- IN SERIES! The one LED on the board is in the standard location off the collector. All of the LEDs can be made to light at the same time.



http://www.youtube.com/watch?v=1uN-yNgtt4c&hl=en

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