>> That's your problem. You should have kept going clockwise from your 
>> center
>> tap. The way you've got it, the two halves of your winding cancel 
>> each
>> other.
>
> Ah - that sorted it - at least the LED is lighting up now. Now to 
> find that
> bag of Nichia 8000mCd white LEDs...

Possibly even easier is to wind two wires in parallel and then join 
start of one to end of other as the centre point.


        RM 

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