Problem: Design and construct a three-band equalizer circuit. Your circuit should include three filters: a low-pass filter that passes frequencies up to about 500 Hz, a band-pass filter that passes frequencies centered around 1073 Hz, and a high-pass filter that passes frequencies above about 2000 Hz. You should be able to adjust the gain of each frequency band independently. You will demonstrate the operation of your equalizer by passing music through your circuit and playing the "equalized" music through a speaker.
System Design: Use the "subsystem" circuits shown on the back of this page to design your equalizer. Which circuit is the low-pass, band-pass, and high-pass filter? How can you tell the "cutoff" frequency of each filter? How should you connect the subsystems to form your equalizer? Do you need "buffer" circuits in your design?
Groups: The morning lab will build one equalizer, and the afternoon lab will build two equalizers. Each equalizer will be built by three groups, which are specified in the table below. Each group will build and test one of the filters (low-, band-, or high-pass), and then you will connect your individual filters to form the equalizer at the end.
DiBello, Glover, Condor
Coppin, Hoskinson, Maroon
Fields, Goldschmidt, Veitas
PM Lab 1
Hansberger, McBride, Eisenstein
Caldwell, Sulick, Torres
PM Lab 2
Durst, Phillips, McCaffrey
Braun, Smith, Tumsuden
Pre-Lab: Study the notes from class, and please arrive to lab on time!