A power supply converter and a method for adjusting a threshold voltage in the power supply converter. Various embodiments of an intruder detection system can be based on, for example, a beam-interrupt detector or a thermal imaging device. amplitude and phase shift, and time delays of the individual paths, comprises receiving a navigation signal and sampling the received navigation signal. A single electrode can form a small value capacitor while still providing a larger conductive area for attaching the capacitor to associated circuitry.