The circiut you describe is called a Resonate Tank. It essentially alternatly stores energy in the field of the coils and between the plates of the capacator. Thus it is creating AC from the DC current. The frequency at which the tank circiut runs is determined by the combination of the coils and the capacator, change the value of either of them will change the operation frequency of your needle.
EDIT:
I went looking for the relationship between Inductance, Capacitance and frequency.
ω=1/([sqr]LC)
Last edited: July 24 2015
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