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Bass and Treble Control Circuit Design for Enhanced Audio Performance

This project explores the design and implementation of a Bass and Treble control circuit using a Baxandall design. We delve into low and high-frequency analysis, employing resistors and capacitors to shape the audio response. The circuit enhances low frequencies around 100 Hz and high frequencies around 12 kHz, thereby boosting kick drum, bass guitar, piano, and flute sounds. Simulation results in LTSpice reveal significant improvements in audio output. Overall, the project demonstrates the effectiveness of tone control in audio applications.

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Bass and Treble Control Circuit Design for Enhanced Audio Performance

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  1. ELEC 3030Final design project Bass & Treble Control Jordan Lewis & Elizabeth Devore

  2. BASS VS. TREBLE • Bass controls low frequencies around 100 Hz • Used to boost kick drum and bass guitar sounds • Treble controls high frequencies around 12kHz • Used to boost sounds from upper octave piano and flutes

  3. BAXANDALL CIRCUIT • Tone control circuits • Uses resistors and capacitors (or inductors) • Low pass filter (treble-cut), attenuates at high frequencies • High pass filter (bass-cut) attenuates at low frequencies

  4. CIRCUIT LTSPICE DESIGN • After some tinkering….

  5. LOW-FREQUENCY ANALYSIS • Vx ≈ 0 • (Vi) / (RLF1+R1) ≈ (-Vo) / (RLF2+R4) • Av ≈ -(RLF2+R4) / (RLF1+R1) • -20dB < Av < 20dB

  6. HIGH-FREQUENCY ANALYSIS • Vx ≈ 0 • (Vi) / (RHF1+R3) ≈ (-Vo) / (RHF2+R6) • Av ≈ -(RHF2+R6) / (RHF1+R3) • -12dB < Av < 20dB

  7. Mid-Frequency Analysis • R7 = R8 = 1 / (2*π*1000*.1uF) = 1.6k • R9 = 1 / (2*π*1000*.001uF) = 160k • Av = (4.7k+(1.6k||RLF2)) / (4.7k+(1.6k||RLF1)) (-2.5dB < Av < 2.5dB)

  8. SIMULATION IN LT SPICE Treble boost Bass boost Mid-band

  9. THE BIG PICTURE • Bass/treble control circuit placed between detector and audio amp • Large gain

  10. BASS Boost Cut Mid

  11. TREBLE • Unable to view well on the scope at higher frequencies • Gain did not appear larger during simulation, but sounds louder

  12. FINAL THOUGHTS ON DESIGN • Audible change in bass and trebleachieved • Overall, great project!

  13. PART II • Mind-numbingly long and tedious hand calculations….

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