A sawtooth generator circuit comprises a first triangular waveform generator with equal ramp up and ramp down rates and a second triangular waveform generator with equal ramp up and ramp down rates and which are equal to the ramp up and ramp down rates of the first triangular waveform generator. In one embodiment, an alarm data image is provided. A driver virtualizes any remaining unrestored data. The nitrogen storage tank supplies the nitrogen rich gas to the bottles for preserving the wine or champagne.