# 1. Construct a circuit using EWB : (show the truth table, k-map, and boolean algebra equations as…

1. Construct a circuit using EWB : (show the truth table, k-map, and boolean algebra equations as the basis of the design).

a) BCD-to-7 segment active low decoder that displays only 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 outputs for binary inputs 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, and 1001, respectively. For inputs 1010, 1011, 1100, 1101, 1110, and 1111, the 7-segment will be blank or totally off.

b. BCD-to-7 segment active high decoder that displays only 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 outputs for binary inputs 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, and 1001, respectively. For inputs 1010, 1011, 1100, 1101, 1110, and 1111, the 7-segment will be blank or totally off.

2. Construct a 4-bit count-up synchronous decade counter which displays decimal values only from 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. After the count of 9, it will go back to 0 and repeat the sequence. Put a clear switch to reset the circuit when necessary. Show the truth table or characteristic table, k-map, and Boolean algebra equation. a) use J-K flip-flop b. use D flip-flop.

3. Using 74192 and 7447 ICs and other logic gates when needed found in EWB, design a 24 second count-down counter push and reset switches. You have the free-will to beautify the features of this circuit with other buttons.

4. Use 2 – 74164 ICs to construct a 16 total output of a sequential lighting system. The initial state of all outputs are all 0s. Draw a truth table with data input A and B and outputs O1 to O16 and indicate the output state of the circuit below.