Description:
One of the famous application of voltage amplifier which is the midterm project is an "Audio Amplifier".  Audio amplifier consist of two type of amplifiers, voltage amplifier (to amplify the signal and control the volume) and current amplifier (to provide enough power to drive the speaker).

Based on the success of the recent midterm project, we think you are ready to build an audio amplifier.
Your final project  is to design and test the amplifier circuit whose specifications are as follows:
 

Specifications:

• The power supply is 120 Vrms at 60 Hz.
• CD stereo input (two channels; left and right) at 250 mV peak output. A source of 250 mV peak sinusoid from the function generator can be used for development and testing purposes.
• Stereo output. The standard load is an 8 Ohm speaker with a power rating of 0.2 Watts.
• Volume control per channel:
• Minimum gain : -3 dB
• Maximum gain : 20 dB
• Frequency range: of 300 Hz - 10 kHz (without distortion).
• Maximum variation in gain over the frequency range: +/- 1 dB
• LED Display with 3 levels at the output:

          Level 1: 0.5 V and above.
          Level 2: 1.0 V and above.
          Level 3: 1.5 V and above.
          Level 4: 2.0 V and above.
Please label each level accordingly.
• Treble and base controls for both channels.

Due Date:
Second week of July.  The presentation and demonstration date will be arranged.
 

Requirements:
You are required to have a:

• Professional  project report  and hand it in prior to your presentation.
• 10 minute presentation with 5 minute question and answer period. All presentations must be done with Power Point.  An example of Power Point presentation can be downloaded here.
• Complete working circuit demonstration and explanation of features.
• Additional bonus prizes are available for those designs who not only meet the specs. but also impress the management team. All engineers who are interested in additional bonuses must highlight and document the innovative features of their circuits. These features include but are not limited to the following:
• audio fidelity.
• power efficiency.
• design simplicity.

Important Note:   A project which does not meet the specifications  will result in a failing grade.
 
 
 
 

Prepared by: C. E. Korman, (202) 994 4952, korman@seas.gwu.edu, April 2000.
Modified for Summer 2000 by :Faisal M. Yasin, cepus@seas.gwu.edu, July 2000.