A power supply including a regulation circuit that maintains an approximately constant load current with line voltage. Each lid has at least two bi-lateral fold lines, such that the lid is configurable into a folded configuration and removable secured within a well of a corresponding pan. The apparatus is arranged such that in use a reforming reaction and a combustion reaction can take place simultaneously, the combustion reaction providing heat for the reforming reaction. Conductive material for the electrode may be formed over the dielectric and in the trench.