The present invention is related to compositions of modafinil, including compositions of modafinil and one or more diluents, disintegrants, binders and lubricants, and the processes for their preparation thereof. The ridge-like protuberance is formed on each sidewall of the cavity to form an interference fit. The turn support member turnably supports the movable unit. The connector hood has inner-sided cogs which interlace with the cogs on the outer side of the cogged crown. The values of the symbols in the digital signal are used to decide the polarity of charge pulses.