Digital Teaching Aid (DED Philippinen, 86 p.) |

__No. 1__ At a distribution point of a conveyer belt a flap
which is controlled by a counter circuit is to divert arriving piece-goods
always six to the left and four to the right.

Fig. 1

The counting pulses T are supplied by a light barrier immediately before the diverting flap. The flap opens the way to the left if the control instructions are x = 1, y = 0 and to the right when x = 0, y = 1

Develop the truth table. Use the sum of product method. For the simplification use a Karnaugh map. Design the logic circuit.

Take a decimal counter with four output lines (2^{0},
2^{1}, 2^{2}, 2^{3}).

__No. 2__ Sketch an asynchronous mod 16 counter. Use JK-MS
flip flops.

__No. 3__ Show how to connect a 74150 multiplexer (Fig. 2) to
implement the following boolean equation:

_{}

Fig. 2

__No. 4__ Input signals R and T are low in Fig. 3. Which is
the active output line when A B C D = 0011?

__No. 5__ To get the y_{9} output line active in Fig.
3, what are the input signals you need?

Fig.
3