An electrostatic discharge protection circuit protects a gate oxide of elements in an internal circuit against ESD. Copper zinc tin sulfide is useful as an absorber material in a thin film solar cell application. A noise spectrum storage device stores an estimated noise spectrum. The method may be carried as instructions on a machine-readable medium and may be carried out using a computer for part or all of the method. The substrate and target core are attached together utilizing a carbide layer and a braze layer.