Patent ID: 8519311

Claim:
A timber drying apparatus for drying timber comprising: a chamber having at least one opening through which timber to be dried can be loaded into the chamber, at least a pair of capacitor plates within the chamber and spaced from each other across the chamber such that a timber load can be contained in said chamber between the capacitor plates, with the capacitor plates positioned in close proximity to the timber load, an RF generating circuit including an adjustable power output device for adjusting a voltage output from said RF generating circuit to compensate for changes in moisture content of a timber load as it dries; and an inductor electrically connected to each of the capacitor plates to form a resonator circuit, the resonator circuit being arranged to resonate with the timber load and to multiply the voltage output of the RF generating circuit by a Q-factor of the inductor to dry the timber load, wherein the resonator circuit is a series resonant circuit that includes a first variable capacitor connected in series with a first end of the inductor, a second variable capacitor connected in series with a second end of the inductor, and a transfer coil connected to transfer a voltage generated by said RF generating circuit in the inductor such that the inductor resonates at a resonance frequency.