GCSE Electronics: Oscilloscope and Sound Waves
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Questions and Answers

What is the purpose of the summing amplifier in the given circuit?

  • To filter out unwanted frequencies
  • To combine multiple input signals into a single output (correct)
  • To provide a fixed output voltage
  • To amplify a single input signal

    • What is the effect of reversing the potentiometer settings on the output of the mixer circuit?

  • The output amplitude increases
  • The output becomes a sine wave
  • The output polarity is reversed (correct)
  • The output becomes a square wave

    • What is the formula used to calculate the output voltage of the summing amplifier?

  • VOUT = RF(V1 + V2)
  • VOUT = -RF(V1/V2)
  • VOUT = -RF(V1 + V2) (correct)
  • VOUT = RF(V1 - V2)

    • What is the minimum number of inputs required for a summing amplifier to function?

    <p>2</p> Signup and view all the answers

    What is the effect of fading each signal in and out at different settings on the mixer circuit?

    <p>The output amplitude varies</p> Signup and view all the answers

    What is the purpose of the 10 kΩ resistors in the summing amplifier circuit?

    <p>To act as a voltage divider</p> Signup and view all the answers

    What is the required change to the circuit to make it a mixer circuit?

    <p>Replace the DC inputs with AC inputs</p> Signup and view all the answers

    What is the primary reason why a sound wave displayed on an oscilloscope appears to be irregular and non-repeating?

    <p>The sound wave is made up of waves of many different frequencies all added together.</p> Signup and view all the answers

    What is the output shape of the mixer circuit when both signals are at maximum amplitude?

    <p>A sine wave</p> Signup and view all the answers

    What is the amplitude of a wave typically defined as?

    <p>The maximum 'height' of the positive part of a wave.</p> Signup and view all the answers

    What is the significance of a sine wave in the context of amplifier systems?

    <p>It is a simple waveform used to study the operation of a basic amplifier system.</p> Signup and view all the answers

    What is the primary advantage of using an oscilloscope to display sound waves?

    <p>It allows for the visualization of the waveform, making it easier to understand.</p> Signup and view all the answers

    What is a common characteristic of sound waves displayed on an oscilloscope?

    <p>They are complex waves made up of many simple waves added together.</p> Signup and view all the answers

    What is the purpose of defining amplitude as the maximum 'height' of the positive part of a wave?

    <p>To avoid confusion when dealing with AC signals.</p> Signup and view all the answers

    What is a characteristic of the waveform of a sound wave displayed on an oscilloscope?

    <p>It is a waveform that looks funny and does not stay still.</p> Signup and view all the answers

    What is the relationship between the amplitude of a wave and its peak value?

    <p>The amplitude is sometimes referred to as the peak value.</p> Signup and view all the answers

    What is the primary function of the non-inverting amplifier in the given circuit?

    <p>To amplify the input signal while preserving its polarity</p> Signup and view all the answers

    What is the purpose of the resistor RF in the non-inverting amplifier circuit?

    <p>To set the amplification gain</p> Signup and view all the answers

    What is the amplitude of the output waveform when the input signal is a 100 mV sinewave?

    <p>4 V</p> Signup and view all the answers

    What happens to the output waveform when the amplitude of the input sinewave is increased to 500 mV?

    <p>The output waveform amplitude increases proportionally</p> Signup and view all the answers

    What is the purpose of using a dual-trace oscilloscope in this experiment?

    <p>To observe the input and output waveforms simultaneously</p> Signup and view all the answers

    What is the gain of the non-inverting amplifier in this circuit?

    <p>4</p> Signup and view all the answers

    What is the frequency of the output waveform in this experiment?

    <p>1 kHz</p> Signup and view all the answers

    What is the purpose of the resistor R1 in the non-inverting amplifier circuit?

    <p>To provide a feedback path</p> Signup and view all the answers

    Study Notes

    Sound Waves and Oscilloscopes

    • An oscilloscope can be used to demonstrate what a sound wave looks like by connecting it to a microphone and talking.
    • The oscilloscope will show a complex waveform that doesn't stay still and is unlikely to repeat itself.
    • This is because sound waves are made up of waves of many different frequencies all added together.

    Amplitude of a Wave

    • An AC signal contains both positive and negative voltages.
    • Amplitude is defined as "the maximum 'height' of the positive part of a wave".
    • It is also referred to as peak value or maximum value.

    Operational Amplifiers

    • A simple waveform called a sine wave can be used to study the operation of a basic amplifier system.
    • A summing amplifier can be used to add multiple signals together.
    • The output voltage of a summing amplifier can be calculated using the formula: VOUT = -RF(V1/R1 + V2/R2).

    Exercise 5.6

    • A summing amplifier can be used to add two DC voltages together.
    • To use the circuit as a mixer, the DC inputs would need to be replaced with two AC inputs.

    Investigation 5.1

    • A non-inverting amplifier can be set up using a TL081 (or equivalent) op-amp connected to a ± 9 V power supply.
    • The output voltage of the amplifier can be observed using an oscilloscope.
    • The amplitude of the input signal can be increased to observe the effect on the output waveform.

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    Operational Amplifiers PDF WJEC 2017

    Description

    This quiz explores the use of oscilloscopes to visualize sound waves, connecting it to a microphone and observing the waveform.

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