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Answer the number of devices (digital circuit) curriculum design】 【Answer is controlled by digital circuits and the expansion of the main circuit. Priority encoder circuit, latch, decoder circuit will be teams of the input signal in the display output with control circuitry and the host switch alarm circuits, and above the main circuit composed of two parts. Through the timing circuit and decoding circuit to generate pulse signals in the display output timing functions, constitute the expansion of the circuit. After wiring, welding, testing, etc. Answer the number of devices after the forming.