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Design Engineering 1.3 Electronics Home Lab 2 Explained Electronic Circuits Peter Cheung Department of Electrical & Electronic Engineering Imperial College London URL: www.ee.ic.ac.uk/pcheung/teaching/DE1_EE/ E-mail:

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Lab 2 Explained Slide 1 PYKC 26 May 2020 DE 1.3 - Electronics 1

Home Lab 2 Explained Electronic Circuits

Peter Cheung Department of Electrical & Electronic Engineering Imperial College London URL: www.ee.ic.ac.uk/pcheung/teaching/DE1_EE/ E-mail: p.cheung@imperial.ac.uk

Design Engineering 1.3 – Electronics

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Lab 2 Explained Slide 2 PYKC 26 May 2020 DE 1.3 - Electronics 1

◆ You will be using the function generator to produce a digital

waveform or a sine wave as the voltage source at different frequencies to drive your circuits.

◆ You will build your circuits on the breadboard. ◆ You will measure the voltages on your circuits using the scope or

using a multimeter.

◆ You may want to use male end of ribbon cable to loosen contacts

before inserting a component or a hookup wire.

Experimental Setup

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Lab 2 Explained Slide 3 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 1: Calibrating the DC voltage source

◆

Analogue signals: DC, SINE, Exponential, NOISY

◆

Digital signals: CLOCK, PWM, UARTModern digital circuits use lower

voltages. We will be using digital circuits operating at 3.3v level.

◆

In Task 1, you calibrate the DC source by finding out the measured voltage vs the voltage settings:

2.86

3.18

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Lab 2 Explained Slide 4 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 2: Source resistance

3.18 2.09 1.02 1.93 1.7 1.0 1.93

28.4mA

37.7 +

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Lab 2 Explained Slide 5 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 3: Voltage Divider Circuit

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Lab 2 Explained Slide 6 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 4: Thevenin Equivalent Circuit

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Lab 2 Explained Slide 7 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 5: Complex Resistor Network

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Lab 2 Explained Slide 8 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 6: RC circuits & Exponential signal

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Lab 2 Explained Slide 9 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 7: RC circuits – lowpass filter

Gain (dB) 20log10(VO/VS)

20dB/decade

Corner frequency fC

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Lab 2 Explained Slide 10 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 8: PWM signal & lowpass filter

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Lab 2 Explained Slide 11 PYKC 26 May 2020 DE 1.3 - Electronics 1

Task 9: PWM & LED brightness

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Lab 2 Explained Slide 12 PYKC 26 May 2020 DE 1.3 - Electronics 1