Abstract: A transportation case is provided for an automotive engine, transmission, or the like. The transportation case includes a one-piece molded plastic base and a one-piece molded plastic lid. The base includes a substantial uniform wall thickness and comprises an outer peripheral wall connected to a formed bottom to provide an upwardly opening space. The formed bottom defines a wall for receiving an automotive engine, transmission, or the like, and has opposite longitudinally extending feet for resting on a support surface and a fork lift opening between the feet. The lid includes a substantially uniform wall thickness comprising an outer peripheral wall connected to a top wall. The lid outer peripheral wall is received on the base outer peripheral wall to close the upwardly opening space.

Abstract: A transportation case is provided for an automotive engine, transmission, or the like. The transportation case includes a one-piece molded plastic base and a one-piece molded plastic lid. The base includes a substantial uniform wall thickness and comprises an outer peripheral wall connected to a formed bottom to provide an upwardly opening space. The formed bottom defines a wall for receiving an automotive engine, transmission, or the like, and has opposite longitudinally extending feet for resting on a support surface and a fork lift opening between the feet. The lid includes a substantially uniform wall thickness comprising an outer peripheral wall connected to a top wall. The lid outer peripheral wall is received on the base outer peripheral wall to close the upwardly opening space.

Abstract: An improved Class BD amplifier provides an amplified output signal by pulse width modulation techniques by sampling a carrier wave, usually a triangular or saw tooth waveform, according to an input signal to be amplified, as in a conventional class D amplifier. The resulting sampling waveform controls the connectivity of the potential supplies 34, 36 to the power rails 14, 18 via the first switch 12 so that a first potential and a second potential are alternately supplied to the first power rail 14 and so that a third potential and fourth potential are alternately supplied to the second power rail 18. As shown in FIG. 8, the first potential is positive, the second and third potentials are at ground, and the fourth potential is negative. In addition, a constant potential difference is maintained between the first and second power rails 14, 18. The power rails are alternately connected to a Class AD output stage 26 by another switch 30, the connectivity of which is controlled by a second sampling waveform, PWM.

Abstract: An improved Class BD amplifier provides an amplified output signal by pulse width modulation techniques by sampling a carrier wave, usually a triangular or saw tooth waveform, according to an input signal to be amplified, as in a conventional class D amplifier. The resulting sampling waveform controls the connectivity of the potential supplies 34, 36 to the power rails 14, 18 via the first switch 12 so that a first potential and a second potential are alternately supplied to the first power rail 14 and so that a third potential and fourth potential are alternately supplied to the second power rail 18. As shown in FIG. 8, the first potential is positive, the second and third potentials are at ground, and the fourth potential is negative. In addition, a constant potential difference is maintained between the first and second power rails 14, 18.