Laboratory 5.
Binary count

Contents:

1.Binary numbers.
2. 7493 circuit.
3. Binary counter circuit
4. BCD counter circuit.

1. Binary numbers

Convert to binary following decimal numbers: 10, 3, 4, 15.
Convert to decimal following binary numbers: 10, 1, 1101, 1111.
Convert to binary following hexadecimal numbers: 10, 3, 4, A.

2. 7493 circuit

The 7493 circuit is a TTL circuit and consist in 4 flip-flops.
They can be conneceted to count binary or BCD.
Figure 1 presents pin allocation for BCD493 (or 7493).

3. Binary counter circuit

Build the following circuit:

Push the switch and observe the LED.
The count goes from binary 15 to 0.

4. BCD counter circuit.

Disconnect R1 and R2 from the GND and connect it to QB and QD.
Verify the counter output.