Methods, apparatuses, and products passively generate electrical energy from waste heat. Also provided is a superconducting article as a tape, in a power cable, and a power transformer. In this way, a private voice communication signal can be provided to a user, even though the user is not holding the output device to the user’s ear. The piezoelectric element is configured to torsionally oscillate the oscillating mirror part about the torsion bar part. The system implements a RAM-based digital sequencer that provides the capability of loading bit patterns into memory and using these patterns to generate waveforms for clocking a CCD.