Chapter 13: Problem 28

Use Multisim to draw a 555 oscillator with resulting output with \(t_{\text {low }}=2 \mathrm{~ms}\) and \(t_{\text {high }}=5 \mathrm{~ms}\).

Short Answer

Expert verified

A 555 timer oscillator circuit should be successfully designed using Multisim with specific high time and low time durations. The high time (t_{high}) should last 5 milliseconds, while the low time (t_{low}) should be 2 milliseconds, resulting in a square wave output with a total period of 7 milliseconds. This result is achieved by adhering to the formulas for t_{low} and t_{high} when setting the resistor and capacitor values, and through accurate circuit assembly and connection within Multisim.

Step by step solution

Open Multisim Software

Start by opening the Multisim software to create a new design. This software is where you will be designing and simulating the 555 oscillator circuit.

Create a 555 Timer Circuit

On the Multisim interface, look for the 555 timer in the component toolbar on the right. Click on it and place it on your workspace.

Configuring the Capacitor and Resistors

To achieve the low time (t_{low}) of 2 milliseconds and high time (t_{high}) of 5 milliseconds, it is necessary to adjust the values of the resistors and capacitors which are placed in the circuit. The '555 Timer' has two resistors (R1 and R2) and one capacitor (C1) connected to it. Use the formulas \(t_{low} = 0.693 \times R2 \times C1 \) and \(t_{high} = 0.693 \times (R1 + R2) \times C1 \) to calculate the values of R1, R2 and C1.

Connect the Components

Now, you have to draw the connections between the components accordingly as per the design of a 555 TIMER in astable mode. Drag and connect wires between the components to form the circuit. Connect a ground and power source to the relevant pin of the 555 Timer IC. Make sure the polarities are correct.

Run the Simulation

After setting up the design, run the simulation. Multisim should display a graphical waveform representing the output of the functional 555 timer circuit. The output waveform should clearly display a high time (t_{high}) of 5 milliseconds and a low time (t_{low}) of 2 milliseconds.

Analyze the Output

Review the output simulation waveform. The output should be a square wave with a period of 7ms (2ms low, 5ms high). If the output matches the requirements, you've successfully designed a 555 timer circuit with the desired specifications. If the output does not match the requirements, revisit the values of the resistors and capacitors, and readjust them as needed.

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Use Multisim to draw a 555 oscillator with resulting output with \(t_{\text {low }}=2 \mathrm{~ms}\) and \(t_{\text {high }}=5 \mathrm{~ms}\).

Short Answer

Step by step solution

Open Multisim Software

Create a 555 Timer Circuit

Configuring the Capacitor and Resistors

Connect the Components

Run the Simulation

Analyze the Output

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