New liquid crystals applications are being developed apart from optics, imaging and display systems. A liquid
crystal cell can be modeled as a nonlinear capacitor, being its capacitance varied as a function of the applied
electric field. A feedback resonator composed of a capacitance and an inductance presents an oscillation
frequency depending on the value of these components. A tunable feedback resonator based on a nematic
liquid crystal cell as variable capacitance is presented. The circuit has been electrically modeled and validated
with experimental measurements. Oscillation frequencies in the range of kHz have been obtained for the
combination of the inductance and the liquid crystal cell (capacitance) used in the proposed circuit. New
applications for this circuit are currently under study.