The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The controller includes a data processing circuit that performs predetermined processing on data and generates processed data. A remaining data amount of the data storage device is detected in response to an externally input timing signal that is received in synchronism with the data received by the data storage device such that synchronization is performed based on the timing signal. Both pedals alternatively swinging up and down with the lever as the axis allowing a wider swing angle for both pedals to effectively reduce the height of the base subject to force. Variations in intensity of the second FBG may be measured by the photodiode and can be calibrated to the desired measurands. The silicon carbide layer is formed by reacting a gas mixture comprising a silicon source, a carbon source, and a nitrogen source in the presence of an electric field.