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Class B Audio Amplifier Tina Shaw Kendall James Andrew Cruz 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. Today’s Topics

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class b audio amplifier

Class B Audio Amplifier

Tina Shaw

Kendall James

Andrew Cruz

criteria overview
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.
today s topics
Today’s Topics
  • Overview of Class B Amplifier
  • Final Parts Update
  • Schematic
  • P-Spice graphs and simulations
  • Analog measurements
  • Elvis Simulations
  • Budget
  • Resources
output class b configuration
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
parts
Parts
  • Two Twelve Volts Batteries
  • Dual TL082 Op Amp
  • 10K Potentiometer
  • Resistors
  • 2 Capacitors – 1000 microF
  • Speaker 8Ω 5W
  • Bipolar Transistors with Similar ß (hfe)
circuit schematic from pspice
Circuit Schematic from PSpice

DC Power Source

Pre-Amp

Speaker

ClassB amp

transistors
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).

p spice preamp analysis
P-Spice Preamp Analysis

Potentiometer set to 0 resistance

Amplification = R3/R4 + 1 = 28

Gain(dB) = 20log10(Amplification) = 29dB

elvis calculation of low 3db point
Elvis calculation of low 3dB point

(2KHZ signal = 6.89V RMS )

elvis calculation of high 3db point
Elvis calculation of high 3dB point

(2KHZ signal = 6.89V RMS )

voltage at 2khz
Voltage at 2kHz

2V / div

Signal = 6.2V

Freq. = 2KHz

voltage at 6 hz
Voltage at 6 Hz

2V / div

Signal = 6.2 *.707

= 4.4V

Freq. = 6Hz

voltage 70khz
Voltage 70KHz

2V / div

Signal = 6.2 * .707

= 4.4V

Freq. = 70 KHz

distortion
Distortion

Avg. of 100 points

amplifier specs
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

references
References
  • Douglas Self, Audio Power Amplifier Design Handbook, Newnes, 1996
  • Audio Power Amplifier Fundamentals. Retrieved September 1st,2004,from http://www.rocketroberts.com/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/potentio.htm

  • Dr. Mankowski
  • D-Spice
slide27
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