Nano-particles of calcium and phosphorous compounds are made in a highly pure generally amorphous state by spray drying a weak acid solution of said compound and evaporating the liquid from the atomized spray in a heated column followed by collection of the precipitated particles. Previous digital to analog circuitry has been limited to a single type of analog output per DAC and to the use of external precision resistors to set the gain and offset for a single DAC, or a group of DACs. The captured information is stored when including a CNAM query.