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In domestic, commercial, light industrial, and some recreational environments, there exists a requirement for the economical detection of potentially explosive concentrations of inflammable gases. The recently introduced Taguchi gas sensor, or T.G.S., is an inexpensive semiconductor transducer which is sensitive to all inflammable gases, and has electrical characteristics which appear to make it suitable for incorporation into the relevant instruments. These characteristics are presented, as are the basic circuit design concepts for operating the device from both mains and battery power sources. Although brief notes on safety requirements are included, it is not intended that the paper should advocate, or otherwise, the use of the device from this point of view.