  Digital Teaching Aid  (introduction...) Preface Introduction Fundamental Logic Operations - Lesson 1 Introduction Boolean Algebra - Lesson 2 Circuit Analysis and Design - Lesson 3 First Evaluation Karnaugh Mapping - Lesson 4 Karnaugh Mapping II - Lesson 5 Coding - Lesson 6 Flip-Flops - Lesson 7 Second Evaluation Counter - Lesson 8 Data Processing Circuits - Lesson 9 Third Evaluation Answers to Evaluation Problems

### Second Evaluation

No. 1 In a workshop two machines are driven by an electric motor

 Power consumption: motor A = 1 KW motor B = 2 KW

For a new machine of which its motor C receives the power of 4 KW, the maximum main power of Pmax = 4 KW is sufficient only if the two other machines (A and B) are not switched on. Design a circuit which supplies a warning signal Q if a power higher than 4 KW is taken from the main power system by the three machines.

- Truth table
- Karnaugh map
- Logic circuit

No. 2 For a display of the figures 1-6, in the well known spot configuration of a game die, design the code conversion circuit. At the input the figures are binary coded.

T, U, V, W, X, Y, Z are output variables (LED's)

- Truth table
- Karnaugh map
- Logic circuit Figure

No. 3 Design a JK Flip Flop with NAND and AND gates.

- Logic circuit
- Truth table

No. 4 Design a D Flip Flop. Use only NAND gates.

- Logic circuit
- Truth table