Figure 9.1. The input goes into a block labeled buffer. The output of the buffer goes into a schmitt trigger. The output of the trigger goes into one input of a 2 input NAND gate. The output of the gate goes into a block labeled decade counter, memory, decoder, and display. There is another block labeled 1 MHz crystal oscillator. Its output goes into a block labeled divide by one million. The output of the divider is indicated as 1 Hz. This output goes to the Ck input of a JK flip-flop. The not Q output of the flip-flop goes to the decade counter, memory, decoder, and display block. The Q output goes to the other input of the NAND gate. End verbal description.
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