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Worksheet: Passive Wave-shaping Circuits

<^< Passive Wave-shaping Circuits | Course Index | Assessment: Passive Circuits >^>(:nl:)

Objective: To investigate the action of a C-R waveshaping circuit.
Underpinning knowledge: Passive waveshaping circuits.
Apparatus: TINA circuit file, or apparatus to make the following circuit.

TINA Circuit File: Click here to download circuit file
Initial Settings: C = 1µF, R = 1k&#937; (integrating circuit), square wave source at 1kHz.
Requires: Paper, Linear graph paper, pen or pencil.
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).

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)?

Further work:

Construct an integrating circuit for use at 20kHz and a differentiating circuit for use at 50Hz. In both cases, use R = 10k&#937;. Select appropriate values of capacitor in each case and check the effectiveness of your circuits using your circuit simulation software.

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