# Operational Amplifier - PowerPoint

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Operational Amplifier

Executive Diploma In Electronics
& Electrical Technology
14 & 15 Dec 2009
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q1. (a)
i) Based on circuit, determine V1, I1, I2, R.

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q1. (a)
ii) Determine the collector
current Ic flowing in the
circuit in figure 1. Assume
the current gain (β) for the
transistor is equal to 50.

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q1. (b)
Describe about basic transistor amplifier (common emitter
amplifier)
(4m)
Q1. (c)

i) Analog and Digital Electronic

ii) Amplifier

iii) PSPICE / SPICE
(4m x3)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q2.

i) Ideal Op Amp.

ii) Feedback

iii) Filter

iv) Oscillator

v) Comparator
(4m x5)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (a)
i) Assuming an ideal op-amp, determine V (out)

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (a)
ii) Assuming an ideal op-amp, determine the closed loop gain.

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (b)

ii) Instrumentation amplifier

(4m x 2)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (c)
I) Sketch the output voltage waveform for following circuit

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (c)
iI) Sketch the output voltage waveform for following circuit

(2m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q3. (d)

Design a band-pass filter using LM741.

(4m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q4. (a)
Design (and explain) an audio mixer for band-equipment. (Use
Op Amp)

The scenario as bellows:

This audio mixer consists of 8 channels with audio volume
control. These 8 channels can be mixed the audio from various
instruments’ source like lead guitar, bass guitar, drums,
keyboards, microphone and so on.

(10m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q4. (b)
Design (and explain) an automatic system for fish pond. (Use
Op Amp)

The scenario as bellows:

The fish pond has an instrument to measure the dissolved-
oxygen level and a motor to generate water flow for increase
dissolved-oxygen level on water. The control system must be
enabled to:
- Turn on water pumps when dissolved-oxygen level on critical
(such as 4 ppm, pre-set value)
- Turn off water pumps when dissolved-oxygen level back to
normal (such as 6 ppm, pre-set value)                  (10m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q5. (a)

TM Malaysia providing an internet service named as Streamyx.
According to TMnet, the customer can use the internet and
telephone at same time. Describe, or explain (in term of
electronic) how TMnet Streamyx works.

(10m)
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Operational Amplifier
Executive Diploma In Electronics & Electrical Technology

Q5. (b)

Describe the difference between analogue computing and digital
computing
(4m)
Draw any 2 analogue mathematic computing circuit (Op-Amp).
other than summer and subtraction circuit.

(3mx2)

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