Abstract: A method and apparatus for identifying a module installed in a base from a plurality of different modules and selecting a set of functions corresponding to the installed module. A preferred embodiment is the Intelli-Table™ toy that includes three modules, each of which can be installed into an annular channel in the base. When a module is installed, a unique pattern of recesses or flat surfaces on the bottom of the module is detected by a first set of switches in the channel. Based on the unique state of these switches, the base selects a set of functions corresponding to the installed module. Each module includes a plurality of different movable elements that activate a second set of switches in the base. Moving an element activates a switch, causing the base to perform a function unique to that element and to the module installed.

Abstract: A method and apparatus for identifying a module installed in a base from a plurality of different modules and selecting a set of functions corresponding to the installed module. A preferred embodiment is the Intelli-Table™ toy that includes three modules, each of which can be installed into an annular channel in the base. When a module is installed, a unique pattern of recesses or flat surfaces on the bottom of the module is detected by a first set of switches in the channel. Based on the unique state of these switches, the base selects a set of functions corresponding to the installed module. Each module includes a plurality of different movable elements that activate a second set of switches in the base. Moving an element activates a switch, causing the base to perform a function unique to that element and to the module installed.

Abstract: A system having a sensor, a feedback loop comprising a controllable load and an integrator, and a comparator. The light filter is matched to the sensor to allow enough light to be sensed while appearing dark. Current produced by the sensor is received by the controllable load, across which a voltage is detected. Upon a relative change in light intensity, a difference between the detected voltage and a reference voltage is integrated by the integrator over an integration time to produce a feedback signal. The feedback signal completes the feedback loop by controlling the controllable load's impedance and adjusting the value of the detected voltage back to the value of the reference voltage. Thus, relative changes in light intensities are detected while thereafter adjusting to the ambient light conditions. When the difference between the detected voltage and the reference voltage is greater than a preset value, the comparator alters an output voltage.

Abstract: A miniature high frequency power transformer comprises first and second "E" shaped ferrite core halves surrounding mating inner and outer modular transformer bobbins having formed thereon respectively the primary and secondary windings of the transformer. The inner and outer modular transformer bobbins are positioned such that the inner transformer bobbin is inserted into the outer transformer bobbin with the secondary windings surrounded by the primary windings. When assembled, the inner modular transformer bobbin has a protrusion that extends axially therefrom through the outer bobbin and terminates in first core retaining ears at one end of the transformer. Second core retaining ears extend from the opposite end of the transformer, and both ears receive the "E" shaped core halves, maintained in position on the transformer by bonding.