A power supply system includes a power supply; a load coupled to the power supply via a power supply line to receive a voltage therefrom; and a circuit protection device. The present invention further provides for pharmaceutical compositions comprising the same as well as methods of treating, preventing, delaying the time to onset or reducing the risk for the development or progression of a disease or condition for which one or more glucagon receptor antagonist is indicated, including Type I and II diabetes, insulin resistance and hyperglycemia. The hinge connecting the back to the seat is also comprised of PVC tubing. A sequence of images may be processed wherein objects can be detected and tracked in succeeding frames. Responsive to the musical notation, the microprocessor is configured to signal the transducers to provide a physical or tactile sensation to the part of the body of the visually impaired musician.