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Electrical Engineering Reference Manual IC digital circuit experiment of this manual contains the following IC chips (a total of 15 species): 74HC00, 74HC01, 74HC125, 74HC138, 74HC20, 74HC153, 74HC32 74HC283, 74HC04, 74HC86, 74HC74, 74HC76, 74HC90, 74HC194 555 timer .