The present invention concerns a method and a system for feeding a reducing agent into a catalyst device. The charge pump also contains a plurality of up pulse switches and down pulse switches for controlling current flow through the circuit such that only a fraction of the current that flows through the resistor flows into and out of the capacitor for charging and discharging the capacitor. The second coupling member also includes a second locking surface. The composite materials may also be in the form of fused materials in which the metal alloy and the flux composition are randomly distributed and randomly oriented.