NOVELTY - The hydrogen and oxygen gas producing apparatus comprises a sealed tank having an exit for extracting the gas, a modulated direct current source having a positive and a negative output, an anode (32) and a cathode (34) placed within the tank, and a pressure sensor. The modulated direct current source varies with respect to a duty cycle of the outputs. The anode and the cathode are connected to the positive and negative output of the modulated direct current source through a first and second opening in the sealed tank.    USE - Useful for producing brown gas such as hydrogen and oxygen.    ADVANTAGE - The apparatus consumes less electricity for generating brown gas and efficiently produces brown gas with a robust control for the gas production.    DETAILED DESCRIPTION - The hydrogen and oxygen gas producing apparatus comprises a sealed tank having an exit for extracting the gas, a modulated direct current source having a positive and a negative output, an anode (32) and a cathode (34) placed within the tank, and a pressure sensor. The modulated direct current source varies with respect to a duty cycle of the outputs. The anode and the cathode are connected to the positive and negative output of the modulated direct current source through a first and second opening in the sealed tank. The anode and the cathode are partially immersed in water. The pressure sensor is coupled with a third opening to the sealed tank for measuring a pressure of the gas within the tank and connected to the modulated direct current source. The modulated direct current source changes the duty cycle of the outputs with respect to the pressure. The water comprises minerals and salts, and mild acid to improve conduction. The modulated direct current source includes an alternating current source coupled to a rectifier. The rectifier produces the direct current that is modulated by a high current driver (16). The modulated direct current source decreases the duty cycle in response to increase in the pressure and increases the duty cycle in response to decrease in the pressure respectively. The anode and the cathode are alternately positioned and parallel to each other in the sealed tank. The anodes and cathodes are connected to an anode and cathode end by a positive and negative buss respectively. The insulators are affixed to the anodes and cathodes at an end distal to the first anode and the cathode end respectively.    INDEPENDENT CLAIMS are also included for:    (1) a method of producing hydrogen and oxygen; and    (2) an unit for producing hydrogen and oxygen.    DESCRIPTION OF DRAWING(S) - The diagram shows the hydrogen and oxygen gas producing apparatus:    Source power; (10)    High current driver; (16)    Positive output; (24)    Negative output; (26)    Anode; (32)    Cathode. (34)