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Class B Audio Amplifier

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Audio Power Amplifier Fundamentals. ... Class B audio amplifier. ... Basic Car Audio Electronics. Retrieved September 13th, 2004, from ... – PowerPoint PPT presentation

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Title: Class B Audio Amplifier


1
Class B Audio Amplifier
  • Tina Shaw
  • Kendall James
  • Andrew Cruz

2
Criteria Overview
  • Using commonly available operational amplifier to
    build the DC coupled Class B Audio Power
    Amplifier
  • Take measurements from both Physical Instruments
    and Virtual Instruments.

3
Todays Topics
  • Overview of Class B Amplifier
  • Final Parts Update
  • Schematic
  • P-Spice graphs and simulations
  • Analog measurements
  • Elvis Simulations
  • Budget
  • Resources

4
Output Class B Configuration
  • Two transistors
  • One transistor provides power to the load during
    one-half of the wave form cycle
  • Second transistor provide power to load for
    another half of the cycle.
  • Neither transistor remains on for entire cycle
    which allow them cool down during the waveform
    cycle

5
Parts
  • Two Twelve Volts Batteries
  • Dual TL082 Op Amp
  • 10K Potentiometer
  • Resistors
  • 2 Capacitors 1000 microF
  • Speaker 8? 5W
  • Bipolar Transistors with Similar ß (hfe)

6
Circuit Schematic from PSpice
DC Power Source
Pre-Amp
Speaker
Class B amp
7
Transistors
  • Current producing devices and have a relatively
    low input impedance.
  • Two types NPN,PNP
  • Current Gain (Beta)
  • Ratio between collector and base current is call
    Beta (Hfe).

8
(No Transcript)
9
P-Spice Preamp Analysis
Potentiometer set to 0 resistance Amplification
R3/R4 1 28 Gain(dB) 20log10(Amplification)
29dB
10
P-Spice Frequency Response
11
Labview Input Signal
12
Signal After Pre-Amp Section
13
Elvis calculation of low 3dB point
(2KHZ signal 6.89V RMS )
14
Elvis calculation of high 3dB point
(2KHZ signal 6.89V RMS )
15
Voltage at 2kHz
2V / div Signal 6.2V Freq. 2KHz
16
Voltage at 6 Hz
2V / div Signal 6.2 .707
4.4V Freq. 6Hz
17
Voltage 70KHz
2V / div Signal 6.2 .707
4.4V Freq. 70 KHz
18
Max Output Signal (ELVIS)
19
Max Output Clipped (ELVIS)
20
Distortion
Avg. of 100 points
21
Elvis Distortion Limitations
22
Natural Noise
23
Amplifier Specs
Analog
  • 4.8 Watts peak , 2.4 Watts RMS
  • 6Hz 70 KHz
  • Max. Output Signal 6.2V peak
  • 11.9 Watts peak , 5.59 Watts RMS
  • 0Hz 100KHz
  • Max. Output Signal 9.76V peak
  • THD .65

ELVIS
24
(No Transcript)
25
Gannt Chat
26
References
  • Douglas Self, Audio Power Amplifier Design
    Handbook, Newnes, 1996
  • Audio Power Amplifier Fundamentals. Retrieved
    September 1st,2004,from http//www.rocketroberts.c
    om/teachart/amp.htm
  • Class B audio amplifier. Retrieved September
    1st,2004,from http//www.allaboutcircuits.com/vol_
    6/chpt_6/10.html
  • Basic Car Audio Electronics. Retrieved September
    13th, 2004, from
  • http//www.eatel.net/amptech/elecdisc/potenti
    o.htm
  • Dr. Mankowski
  • D-Spice

27
END
  • Question???
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