Abstract: A printed article, such as a greeting card, comprises a substrate formed of card, a sensor for detecting exhaled breath directed at the substrate, the sensor comprising first and second spaced electrodes supported on the substrate, at least one transducer for supplying a user-perceivable signal, such as light emitting diodes, and a switching circuit for causing the at least one transducer to supply the signal in response to detection of exhaled breath.

Abstract: An electronic tag has a plurality of elongate conductive tracks (10) extending in a first longitudinal direction (11) and spaced apart along a second, transverse direction (12). Each track includes relatively wide and relatively narrow portions (13, 14). The plurality of conductive tracks includes at least one pair (16) of tracks providing at least one data-encoding section (17) in which a portion (14) of one track is relatively narrow and a corresponding portion (13) of the other track is relatively wide. This can be used to encode data bits ‘0’ and ‘1’. Data can be read from the data-encoding section by crossing a drive line over each track in the data-encoding section and applying a time-varying signal to the drive line. The regions of cross over form capacitive elements whose relative magnitude can be determined using a capacitance bridge.

Abstract: A method of fabricating an electronic device comprises providing a layer structure (48) supported on a first substrate (34), providing a second, patterned substrate (28) and transferring selected areas (58) of the first layer structure onto the second substrate.