A power source device includes a plurality of small batteries, a plurality of bus bars, a casing, and a battery cover. As just one example, a method for call center processing is described that includes providing a call center system. A first support member supports the projection system, and a second support member supports the liquid confinement member. Source electrode bonding pads of the first semiconductor chip on a high side are electrically connected with a first die pad of the die pads via a metal plate.