Bass Guitar Preamp Design

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Transcript of Bass Guitar Preamp Design

  • BASS GUITAR PREAMP DESIGN Dave Sampson

  • Audiodomain.blogspot.co.uk

    @homewith_dave

    daveisnot@outlook.com

    1

    Id like to dedicate this work to my long term partner Louise. Without her love, patience and

    encouragement this work would not have been possible.

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    2

    TABLE OF CONTENTS

    Chapter 1 ........................................................................................................................ 7

    1.1 History .............................................................................................................................. 7

    1.2 Aims & Objectives ............................................................................................................. 7

    1.3 Summary of Report Structure ........................................................................................... 7

    Chapter 2 ........................................................................................................................ 8

    2.1 Existing Solutions .............................................................................................................. 8

    2.2 Input stage ........................................................................................................................ 8

    2.2.1 Input Signal ................................................................................................................ 8

    2.2.2 Attenuation ................................................................................................................ 9

    2.2.3 Impedance Bridging ................................................................................................... 9

    2.3 Operational Amplifiers ...................................................................................................... 9

    2.3.1 Specifications ........................................................................................................... 10

    2.3.2 Op Amp Rules .......................................................................................................... 11

    2.3.3 Amplification............................................................................................................ 11

    2.3.4 Buffer Amplifier ....................................................................................................... 12

    2.4 Filtering ........................................................................................................................... 13

    2.4.1 Reactance ................................................................................................................ 13

    2.4.2 Passive Filters .......................................................................................................... 13

    2.4.3 Active Filters ............................................................................................................ 14

    2.4.4 Multiple-Feedback Bandpass Filter Topology .......................................................... 15

    2.4.5 Boost/Cut Topology ................................................................................................. 16

    2.4.6 Filter implementation .............................................................................................. 17

    2.5 Power ............................................................................................................................. 17

    2.5.1 Power Supply ........................................................................................................... 17

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    2.5.2 DC Regulation .......................................................................................................... 18

    2.5.3 Split Power Rail ........................................................................................................ 18

    2.5.4 Decoupling ............................................................................................................... 18

    2.6 Output ............................................................................................................................ 19

    2.6.1 Operational Amplifier Based .................................................................................... 19

    2.6.2 Ground Lift ............................................................................................................... 19

    2.6.3 Output Impedance ................................................................................................... 19

    2.7 Design Considerations ..................................................................................................... 19

    Chapter 3 ...................................................................................................................... 20

    3.1 Specification ................................................................................................................... 20

    3.2 Schematic ....................................................................................................................... 20

    3.3 Bill of Materials ............................................................................................................... 20

    Chapter 4 ...................................................................................................................... 22

    4.1 Modular Design ............................................................................................................... 22

    4.2 Enclosure ........................................................................................................................ 22

    4.3 Issues During Construction.............................................................................................. 22

    4.4 Final Schematic ............................................................................................................... 24

    Chapter 5 ...................................................................................................................... 25

    5.1 Test Notes ....................................................................................................................... 25

    5.2 Frequency Response ....................................................................................................... 26

    5.3 Filter Performance .......................................................................................................... 28

    5.3.1 Bandpass Frequency Response ................................................................................ 28

    5.3.2 Summed Filter Response ......................................................................................... 29

    5.3.3 Interaction ............................................................................................................... 33

    5.4 Total Harmonic Distortion + Noise .................................................................................. 37

    5.5 Signal to Noise Ratio ....................................................................................................... 38

    5.6 Impedance ...................................................................................................................... 38

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    5.7 Current Draw .................................................................................................................. 39

    5.8 Output Level ................................................................................................................... 39

    5.8.1 Line Level ................................................................................................................. 39

    5.8.2 Instrument Level ...................................................................................................... 39

    Chapter 6 ...................................................................................................................... 40

    6.1 Further Work .................................................................................................................. 40

    6.2 Conclusions ..................................................................................................................... 41

    References .................................................................................................................... 42

    Appendices ................................................................................................................... 45

    1: Electronic Circuit Equations .............................................................................................. 45

    1.1: Ohms Law .................................................................................................................. 45

    1.2: Kirchoffs Current Law ............................................................................................... 45

    1.3: Kirchoffs Voltage Law ............................................................................................... 45

    1.4: Threvins equivalent circuit ...................................................................................... 45

    1.5: Series Resistance: ...................................................................................................... 46

    1.6: Parallel Resistance: .................................................................................................... 46

    2: Commercial Preamp Specifications ..........................