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AB21
Class A Amplifier
Analog Lab
Experiment Board
Ver. 1.0
QUALITY POLICY
To be a Global Provider of Innovative and Affordable
Electronic Equipments for Technology Training by
enhancing Customer Satisfaction based on
Research, Modern manufacturing techniques and
continuous improvement in Quality of the products
and Services with active participation of employees.
An ISO 9001: 2000 company
94-101, Electronic Complex, Pardesipura INDORE-452010, India.
Tel.: 91-731-2570301 Fax: 91-731-2555643
Email: [email protected] Web: www.scientech.bz
AB21
Scientech Technologies Pvt. Ltd.
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AB21
Class A Amplifier
AB21
TABLE OF CONTENTS
1.Introduction
4
2. Theory
6
3.Experiment
7
To study the operation of Class A Amplifier.
4.Datasheet
9
5.Warranty
11
6.List of Service Centers
11
7.List of Accessories with AB21
12
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AB21
INTRODUCTION
AB21 is a compact, ready to use Class A Amplifier experiment board. This
is useful for students to understand the working and operation of various
Voltage amplifier categories. It can be used as stand alone unit with
external DC power supply or can be used with SCIENTECH ANALOG
LAB ST2612 which has built in DC power supply, AC power supply,
function generator, modulation generator, continuity tester, toggle switches,
and potentiometer.
List of Boards :
Model
AB01
AB02
AB03
AB04
AB05
AB06
AB07
AB08
AB09
AB10
AB11
AB14
AB15
AB16
AB17
AB18
AB19
AB20
AB22
AB23
AB25
AB28
AB29
AB30
AB31
AB32
AB33
Name
Diode characteristics (Si, Zener, LED)
Transistor characteristics (CB NPN)
Transistor characteristics (CB PNP)
Transistor characteristics (CE NPN)
Transistor characteristics (CE PNP)
Transistor characteristics (CC NPN)
Transistor characteristics (CC PNP)
FET characteristics
Rectifier Circuits
Wheatstone Bridge
Maxwell’s Bridge
Darlington Pair
Common Emitter Amplifier
Common Collector Amplifier
Common Base Amplifier
Cascode Amplifier
RC-Coupled Amplifier
Direct Coupled Amplifier
Class B Amplifier (push pull emitter follower)
Class C Tuned Amplifier
Phase Locked Loop (FM Demodulator & Frequency
Divider / Multiplier)
Multivibrator (Mono stable / Astable)
F-V and V-F Converter
V-I and I-V Converter
Zener Voltage Regulator
Transistor Series Voltage Regulator
Transistor Shunt Voltage Regulator
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AB21
AB41
AB42
AB43
AB44
AB45
AB51
AB52
AB53
AB54
AB56
AB65
AB66
AB67
AB68
AB80
AB81
AB82
AB83
AB84
AB85
AB88
AB89
AB90
AB91
AB92
AB93
AB96
AB97
AB101
AB102
AB106
Differential Amplifier (Transistorized)
Operational Amplifier (Inverting / Non-inverting /
Differentiator)
Operational Amplifier (Adder/Scalar)
Operational Amplifier (Integrator/ Differentiator)
Schmitt Trigger and Comparator
Active filters (Low Pass and High Pass)
Active Band Pass Filter
Notch Filter
Tschebyscheff Filter
Fiber Optic Analog Link
Phase Shift Oscillator
Wien Bridge Oscillators
Colpitt Oscillator
Hartley Oscillator
RLC Series and RLC Parallel Resonance
Kirchoff’s Laws (Kirchhoff’s Current Law & Kirchhoff’s
Voltage Law)
Thevenin’s and Maximum power Transfer Theorem
Reciprocity and Superposition Theorem
Tellegen’s Theorem
Norton’s theorem
Diode Clipper
Diode Clampers
Two port network parameter
Optical Transducer (Photovoltaic cell)
Optical Transducer (Photoconductive cell/LDR)
Optical Transducer (PhotoTransistor)
Temperature Transducer (RTD & IC335)
Temperature Transducer (Thermocouple)
DSB Modulator and Demodulator
SSB Modulator and Demodulator
FM Modulator and Demodulator
………… and many more
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AB21
THEORY
The class A amplifiers are the amplifiers which deliver maximum
undistorted symmetrical output voltage swing to the low impedance load.
Generally any system (like a stereo, radio or television) consists of several
stages of amplification. When the signal passes through these stages, the
power level of signal rises so much that the later stages require high power
handling circuit elements such as power transistors. Also as the load
impedance of these later stages is very small (of the order of 8 ohm for
stereo amplifier speakers), heavy collector current flows. To handle this,
transistors heaving power rating of 1W or more are used in power
amplifiers.
Power amplifiers are broadly classified as :
1.
Class A (Voltage Amplifier)
2.
Class B (Push-Pull Emitter Follower)
3.
Class C Tuned Amplifier
Class A Amplifier :
Class A amplifier is basically a voltage amplifier in which transistor
operates in active region for the entire cycle of input AC signal. In other
words the collector current flows for 360° of AC signal
Fig. 1
For class A amplifiers the Q point is located somewhere near the middle of
the AC load line and thus offers maximum amplification of the input signal
as shown below :
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AB21
Fig. 2
The collector current IC is non-zero even when the input signal is zero i.e.
the IC flows for 100% of time. This leads to power dissipation even in
quiescent condition.
EXPERIMENT
Objective :
To study the operation of Class A Amplifier.
Apparatus required :
1.
Analog board of AB21.
2.
Variable DC power supply +12V from external source or ST2612
Analog Lab.
3.
Function Generator.
4.
Oscilloscope.
Circuit diagram :
Circuit used to study the operation of Class A Amplifier is shown below :
Scientech Technologies Pvt. Ltd.
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AB21
Fig. 3
Procedure :
•
Connect +12V variable DC power supplies at their indicated position
from external source or ST2612 Analog Lab.
•
1.
Connect 1Vp-p AC signal (1KHz) at the Vin input of the AB21.
2.
Gradually increase the input signal up to the value before the signal
just get clipped or decrease the DC supply voltage to the value before
the signal just get clipped. This is the maximum amplification of
Class A Amplifier AB21.
3.
Calculate the peak-to-peak value of the output signal.
Connect Oscilloscope at the output terminals of AB21 and observe
the output waveform.
Results
Input ac signal amplitude (Vin)
: ...................................Vp-p
Output ac signal amplitude (Vout)
: ...................................Vp-p
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AB21
Voltage gain (A = Vout/Vin)
Scientech Technologies Pvt. Ltd.
: .................................
9
AB21
DATASHEET
Scientech Technologies Pvt. Ltd.
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AB21
WARRANTY
1)
We guarantee the instrument against all manufacturing defects
during 24 months from the date of sale by us or through our dealers.
2)
The guarantee covers manufacturing defects in respect of indigenous
components and material limited to the warranty extended to us by
the original manufacturer, and defect will be rectified as far as lies
within our control.
3)
The guarantee will become INVALID.
a)If the instrument is not operated as per instruction given in the
instruction manual.
b)If the agreed payment terms and other conditions of sale are not
followed.
c) If the customer resells the instrument to another party.
d)Provided no attempt have been made to service and modify the
instrument.
4)
The non-working of the instrument is to be communicated to us
immediately giving full details of the complaints and defects noticed
specifically mentioning the type and sr. no. of the instrument, date of
purchase etc.
5)
The repair work will be carried out, provided the instrument is
dispatched securely packed and insured with the railways. To and fro
charges will be to the account of the customer.
DESPATCH PROCEDURE FOR SERVICE
Should it become necessary to send back the instrument to factory please
observe the following procedure:
1)
Before dispatching the instrument please write to us giving full
details of the fault noticed.
2)
After receipt of your letter our repairs dept. will advise you whether
it is necessary to send the instrument back to us for repairs or the
adjustment is possible in your premises.
Dispatch the instrument (only on the receipt of our advice) securely packed
in original packing duly insured and freight paid along with accessories and
a copy of the details noticed to us at our factory address.
Scientech Technologies Pvt. Ltd.
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AB21
LIST OF SERVICE CENTERS
1. Scientech Technologies Pvt. Ltd.
90, Electronic Complex
Pardesipura,
INDORE – 452010
2. Scientech Technologies Pvt. Ltd.
First Floor, C-19,
F.I.E., Patparganj Industrial Area,
DELHI – 110092
3. Scientech Technologies Pvt. Ltd.
New no.2, Old no.10, 4th street
Venkateswara nagar, Adyar
CHENNAI – 600025
4. Scientech Technologies Pvt. Ltd.
202/19, 4th main street
Ganganagar,
BANGALORE- 560032
5. Scientech Technologies Pvt. Ltd.
8,1st floor, 123-Hariram Mansion,
Dada Saheb Phalke road,
Dadar (East),
MUMBAI –400014
6. Scientech Technologies Pvt. Ltd.
988, Sadashiv Peth,
Gyan Prabodhini Lane,
PUNE – 411030
7. Scientech Technologies Pvt. Ltd
SPS Apartment, 1st Floor
2, Ahmed Mamoji Street,
Behind Jaiswal Hospital,
Liluah, HOWRAH-711204 W.B.
8. Scientech Technologies Pvt. Ltd
Flat No. 205, 2nd Floor,
Lakshminarayana Apartments
‘C’ wing, Street No. 17,
Himaytnagar,
HYDERABAD- 500029
Scientech Technologies Pvt. Ltd.
Ph : (0731) 2570301
Email : [email protected]
Ph : (011) 22157370, 22157371
Fax : (011) 22157369
Email : [email protected]
Ph : (044) 42187548, 42187549
Fax : (044) 42187549
Email : [email protected]
Ph : (080) 51285011
Fax : (080) 51285022
Email : [email protected]
Ph : (022) 56299457
Fax : (022) 24168767
Email : [email protected]
Ph : (020) 24461673
Fax : (020) 24482403
Email : [email protected]
Ph : +913355266800
Email : [email protected]
Ph : (040) 55465643
Email : [email protected]
12
AB21
LIST OF ACCESSORIES
1.
2mm Patch cord (red) .........................................................2 Nos.
2.
2mm Patch cord (black) ......................................................2 Nos.
3.
2mm Patch cord (blue) ........................................................5 Nos.
Scientech Technologies Pvt. Ltd.
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