A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The first N-to-1 selection circuit is configured to route a true or complementary version of a selected first input signal to an output thereof in response to a first multi-bit selection signal, where N is an integer greater than one. Using a spread trading algorithm, a spread price axis is generated and the trader may place an order for the trading strategy at a desired price, comprising placing an order in one leg market dependent on the market conditions of another leg market. During switching, the layer is first placed in the less stable state by a word line current, so that a small bit line current can switch its magnetization direction. To prevent buckling of the firing bar strip during firing, a pair of support plates adjustably flank the firing bar strip through the articulation mechanism.