Abstract: Disclosed is a thermal conduction-electrical conduction isolated circuit board with a ceramic substrate and a power transistor embedded, mainly comprising: a dielectric material layer, a heat-dissipating ceramic block, a securing portion, a stepped metal electrode layer, a power transistor, and a dielectric material packaging, wherein a via hole is formed in the dielectric material layer, the heat-dissipating ceramic block is correspondingly embedded in the via hole, the heat-dissipating ceramic block has a thermal conductivity higher than that of the dielectric material layer and a thickness less than that of the dielectric material layer, the stepped metal electrode layer conducts electricity and heat for the power transistor, the dielectric material packaging is configured to partially expose the source connecting pin, drain connecting pin, and gate connecting pin of the encapsulated stepped metal electrode layer.

Abstract: In accordance with the present invention, the circuit apparatus has a first and a second connection point each for respectively connecting to the first bay and second bay for communicating with them to determine which device in the bays is the master device. The circuit apparatus also has a third and a fourth connection point both of them for connecting to the first bay or second bay for receiving the Boolean algebra to determine which device is the master device. The circuit apparatus further has a fifth connection point for determining whether the circuit apparatus works.

Abstract: In accordance with the present invention, the circuit apparatus has a first and a second connection point each for respectively connecting to the first bay and second bay for communicating with them to determine which device in the bays is the master device. The circuit apparatus also has a third and a fourth connection point both of them for connecting to the first bay or second bay for receiving the Boolean algebra to determine which device is the master device. The circuit apparatus further has a fifth connection point for determining whether the circuit apparatus works.

Abstract: In accordance with the present invention, the circuit apparatus has a first and a second connection point each for respectively connecting to the first bay and second bay for communicating with them to determine which device in the bays is the master device. The circuit apparatus also has a third and a fourth connection point both of them for connecting to the first bay or second bay for receiving the Boolean algebra to determine which device is the master device. The circuit apparatus further has a fifth connection point for determining whether the circuit apparatus works.

Abstract: A transitional system uses two switching circuits to receive the same selection signal generated by an OR gate. This selection signal switches the two switch circuits and thereby assigns the floppy disc controller to connect to the corresponding bay connectors in accordance with which bay connector is connected to the floppy disc drive. Such assignment ensures that the floppy disc controller connects to the floppy disc drive.

Abstract: A transitional system uses two switching circuits to receive the same selection signal generated by an OR gate. This selection signal switches the two switch circuits and thereby assigns the floppy disc controller to connect to the corresponding bay connectors in accordance with which bay connector is connected to the floppy disc drive. Such assignment ensures that the floppy disc controller connects to the floppy disc drive.

Abstract: In accordance with the present invention, the circuit apparatus has a first and a second connection point each for respectively connecting to the first bay and second bay for communicating with them to determine which device in the bays is the master device. The circuit apparatus also has a third and a fourth connection point both of them for connecting to the first bay or second bay for receiving the Boolean algebra to determine which device is the master device. The circuit apparatus further has a fifth connection point for determining whether the circuit apparatus works.