<^< Passive Wave-shaping Circuits | Course Index | Assessment: Passive Circuits >^>
| Objective:
| To investigate the action of a C-R waveshaping circuit.
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| Underpinning knowledge:
| Passive waveshaping circuits.
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| Apparatus:
| TINA circuit file, or apparatus to make the following circuit.
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| TINA Circuit File:
| Click here to download circuit file
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| Initial Settings:
| C = 1µF, R = 1kΩ (integrating circuit), square wave source at 1kHz.
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| Requires:
| Paper, Linear graph paper, pen or pencil.
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| Instructions:
(a) Calculate the time constant of the circuit (C x R).
(b) Display two or three cycles of the input and output waveforms using a common time scale. Sketch these waveforms and include labelled axes of voltage and time.
(c) Repeat (a) and (b) with C = 10µF, C = 100µF, C = 100nF and C = 10nF.
(d) Reconnect the circuit as an integrating circuit (i.e. swap the capacitor and resistor over).
(e) Repeat steps (a) to (c).
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Observations:
Comment on the waveforms produced by the circuit. What can you say about the effectiveness of each type of circuit in terms of the time constant (C x R) and the periodic time of the square wave input (1ms)?
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| Further work:
Construct an integrating circuit for use at 20kHz and a differentiating circuit for use at 50Hz. In both cases, use R = 10kΩ. Select appropriate values of capacitor in each case and check the effectiveness of your circuits using your circuit simulation software.
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<^< Passive Wave-shaping Circuits | Course index | Assessment: Passive Circuits >^>
