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# Circuit to Control a Traffic Signal - Assignment Example

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The aim of the paper “Circuit to Control a Traffic Signal” is to design and implement a sequential circuit using JK flip flops and control the working of a traffic signal having the following characteristics. The given question asks us to implement a circuit for monitoring a traffic signal…

## Extract of sample "Circuit to Control a Traffic Signal"

Download file to see previous pages The basic storage element in a sequential logic is called the flip-flop. The primary advantage of synchronous logic is its simplicity. Also, the hardware required in sequential circuits is considerably lesser when compared to a combinational circuit undertaking the same task.
1. The clock pulse should be distributed to every flip-flop in the circuit. Since the clock is usually a high-frequency signal, this arrangement consumes large amounts of power and dissipates considerable amounts of heat. Even the flip-flops that are not involved in the current operation consume a small amount of power, thereby dissipating heat in the chip.
To design the circuit for the light outputs, we draw a truth table showing the times at which the green, amber and red lights are turned ON. The individual flip flop outputs of the counter are used to denote the variation in time. We then simplify the obtained equation using maps and hence obtain the final circuit.
The flip flop is an edge-triggered device. Its working and characteristics are similar to that of an RS flip flop, but the feedback lines provided ensure that the 1, 1 uncertainty condition of the RS flip flop is avoided. The input 1, 1 operates the JKFF in toggle mode.
The 7476 IC is a dual JKFF. It is a positive edge triggered. Information is loaded on to the master when the clock pulse is high and transferred to the slave during the transition of the clock state. IC 74LS76 is a negative edge triggered by JKFF. The SET and RESET inputs are active low asynchronous terminals. They are used to bring the FF to the desired state, irrespective of the clock and the JK values.
Synchronous counters are used to count binary sequences using minimum hardware. They can be designed using any type of flip flop. The number up to which the circuit can count depends on the number of flip flops used. ...Download file to see next pagesRead More
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