Compounds that inhibit DNA-dependent protein kinase, compositions comprising the compounds, methods to inhibit the DNA-PK biological activity, methods to sensitize cells the agents that cause DNA lesions, and methods to potentiate cancer treatment are disclosed. The voltage regulator devices may be output filters, inductors, capacitors, and the like. Mirrors disposed about the chiral nematic material define a resonant optical cavity. The cassette member has an outer face adapted to oppose the inner face of the cassette chamber when the cassette member is inserted into the cassette chamber. FM demodulation, the signal is averaged wherein a substantially large value is produced for non-traditional radar signals and a value approximately equal to zero is produced for a communication signal that is not FM modulated with a continuously increasing frequency signal. The method includes connecting a de-coupled capacitance across the supply and ground voltages, and connecting a band-pass shunt regulator that is in parallel to the capacitor across the supply and ground voltages.