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ECE 11 Final Project: Boom Box Design and Implementation

ECE 11 Final Project: Boom Box Design and Implementation. By Scott Trocchia ECE 11 Fall 2008 Professor Korman, GTA Yi Jin Presented on 12/16/08. Definition: break large project (seemingly complicated and daunting task) into its constituents (piece by piece)

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ECE 11 Final Project: Boom Box Design and Implementation

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  1. ECE 11 Final Project: Boom Box Design and Implementation By Scott Trocchia ECE 11 Fall 2008 Professor Korman, GTA Yi Jin Presented on 12/16/08

  2. Definition: break large project (seemingly complicated and daunting task) into its constituents (piece by piece) • The following slides will explain the circuit through this concept The Approach: Divide and Conquer

  3. 1st order • Inverting design • Establish unity gain • Simple illustration of phasor usage • Eliminates all noise above 10 kHz Stage [1] : Initial Low Pass Filter

  4. Treble channel 2nd order high pass filter • Reason for order? • Unity gain • Frequency range of interest: 5360 Hz to 10 kHz Stage [2a]: Decision to make - Treble or Bass?

  5. Bass channel 2nd order low pass filter • R  C, C  R • Unity gain, again • Frequency range of interest: 150 Hz to 7360 Hz Stage [2b]: Decision to make - Treble or Bass?

  6. Same for treble and bass channels • C6 and R8 together represent passive low pass filter • Attenuates all frequency <150 Hz • C7 makes sure AC voltage passes to speaker Stage [3]: Output Stage

  7. Concept of voltage ladder (+,- polarity) • Initial resistor  highest voltage drop • Personal preference and guess and check • LED resistor? Treble’s Voltage Ladder

  8. Concept of voltage ladder (+,- polarity) • Personal preference, again • LED resistor and why we need it Bass’s Voltage Ladder

  9. Troubleshooting • Parts • Time issue? • Lessons learned and applications Troubleshooting / Problems / Resolutions

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