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Solved Step by Step With Explanation- 555 Timer Circuit Design

Questions

Positive Duty Cycle: 80% (+/-5%)

Frequency: 20Hz (+/-2Hz)

Your circuit should meet circuit building standards. Specifically we will be checking that your circuit has met the requirements for

Wire colour standards

Assessment Instructions

You will need to bring your drawn circuit diagram, calculations, built circuit, along with your electrical kit to the assessment session. You will be asked to hook up your circuit to the digital storage oscilloscope (DSC) to display the waveform at the output node of your timer along with the measurements for frequency and positive duty cycle. You may be asked additional questions about your work.

Let's go through the steps for designing and building a circuit using a 555 timer IC to generate an output waveform with the specified characteristics:

Objective: Design a circuit to produce an output waveform with the following characteristics:

2. Two resistors (R1 and R2)

3. One capacitor (C1)

I'll describe how to connect these components following the circuit diagram standards:

1. 555 Timer IC:

3 - OUT (Output)

4 - RESET

2. Resistor Connections:

   • Connect one end of R1 to Pin 7 (DISCH) of the 555 timer.

3. • Connect one end of C1 to Pin 2 (TRIG) of the 555 timer.

   • Connect the other end of C1 to Pin 1 (GND) of the 555 timer.

5. Output:

   • Connect Pin 3 (OUT) of the 555 timer to your oscilloscope probe or load resistor as needed.

f = 1.44 / ((R1 + 2 * R2) * C1)

Now, calculate R1 and R2:

You want a duty cycle of 80% (+/-5%).

Now, calculate R1: