An apparatus for extracting potable water from the environment air comprises a moisture collecting system having dew-forming surfaces and disposed so that the air drawn into the apparatus passes therethrough and moisture from the air condenses in the dew-forming surfaces. The earth electrode connected with one side of the combustion pressure sensor is provided on a whole surface opposite to a combustion pressure signal electrode. A variety of delivery mechanisms may be used. In the second family, each section is laid out in a different sequence: output pad, operational amplifier, logic circuit, level shifter, decoder.