Brigham Young University –Electrical & Computer Engineering Dept. 240 LabLab4 outline W16 Page 1 of 8 Dawson 13 Jan 2016 ECEn 240 Circuits Laboratory Lab 4 - Audio Balance Control BeforeLab, write-up to the Experimental Procedure section
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Brigham Young University –Electrical & Computer Engineering Dept. 240 LabLab4 outline W16 Page 2 of 8 Dawson 13 Jan 2016 PRELIMINARY PROJECT OVERVIEW Purpose Include in write-up, okay to cut & paste The purpose of this laboratory is to analyze and implement stereo Balance Control, which will be sub-components in your stereo system. Also analyze Signal Processing Losses and the influences of downstream changes on upstream performance. Objectives Include in write-up, okay to cut & paste Review and discuss for understanding Balance ‘Design Specifications’DiscussBalance ControlDiscuss/Compare ‘Linear’ taper vrs audio taperDiscuss inverse trackingDiscuss Signal Processing Losses Calculate Thèvenin equivalents of the design circuit Measure and compute balance control output data Observe interference between Volume & Balance controls Analyze data for downstream influences on upstream Demonstrate integrated balance control of the stereo system Design Specifications Include in write-up, okay to cut & paste Dual channel: left & rightTracking:InverseControl: single trackingDifferential Attenuation: <-1dB @ full volume to >-60dB @ no volumeInput impedance: >600ΩOutput impedance: ≤10KΩResponse curve: LinearEquipment List Include in write-up, okay to cut & paste 240 Stereo chassis CD or MP3 player Lab Power Amp DMM, Power Supply Calculator Discussion Briefly explain, in your own words, these four topics Balance:One of the functions of a stereo amplifier is to control the relative signal level, or balance, between the left and right channels as delivered to the power amplifier stage. Variations in room acoustics, listener position, speaker sensitivity, etc. require us to be able to adjust the relative level between the right and left channels. A simple approach would be to just provide two separate volume controls, but it is a more common practice to leave the master Volume alone and use a separate dual ganged potentiometer to adjust the Balance independent of the master volume. In this lab you will take the common approach of combining, or ganging two controls onto a single knob shaft so that you can manipulate both channels simultaneously.