Abstract: A standard dual timing integrated circuit contains two independent 555-type timers on a single monolithic chip, each timer section has a terminal pin for connection to external circuitry for supply voltage, control voltage, and has internal circuitry which has terminal pins for connection to external circuitry for reset, trigger, output, discharge, and threshold connections. A multiple resistance-capacitor circuit is connected to the discharge, threshold, trigger, and ground pins of the first timer section with the resistance values being manually selectable between three discrete resistance values, each corresponding to a predetermined sound mode, to provide three separate discharge rates of the capacitor and thus provide at the output pin of the first timer section a voltage waveform of one of three predetermined configurations corresponding to the selected sound mode. Thus, the first timer section acts as a modulator.

Abstract: An array of interdigitally related elements are interstitially spaced from one another, with alternate elements in the array connected to a first conductor and the remaining elements in the array connected to a second conductor. A conductive member, such as a metallic ball, is freely movable in two dimensions over the area of the array, electrically coupling and decoupling adjacent elements in the array as it moves. A circuit is connected between the first and second conductors and detects the coupling of and/or decoupling of electrical contact between adjacent elements as the ball moves over the elements, with the frequency of the coupling and/or decoupling being detected to indicate a predetermined motion or absence of motion. The elements may take different configurations for different desired results.