An improved catheter is provided that is particularly useful for mapping the Purkinje fibers for potential diagnosis of ventricular fibrillation. In one embodiment, the invention includes a substrate having a buried insulator layer formed over the substrate and an active layer formed over the buried insulator layer. A deep n-well is located under the isolation region and the striped active area. The present invention examines P2P messages between and within networks and provides a cost efficient path to handle each P2P message. In the apparatus, each of a toner-supplying developer-carrying member and the toner-collecting developer-carrying member has a conductive substrate to which a bias voltage is applied, and at least one of the surfaces of the conductive substrates of the toner-supplying developer-carrying member and the toner-collecting developer-carrying member has a resistive layer formed thereon. The second transformer is used for transforming the supply voltage signal into a second operating signal to each second end of the plurality of light sources.