Book description
Small Signal Audio Design is a highly practical handbook providing an extensive repertoire of circuits that can be assembled to make almost any type of audio system. The publication of Electronics for Vinyl has freed up space for new material, (though this book still contains a lot on moving-magnet and moving-coil electronics) and this fully revised third edition offers wholly new chapters on tape machines, guitar electronics, and variable-gain amplifiers, plus much more. A major theme is the use of inexpensive and readily available parts to obtain state-of-the-art performance for noise, distortion, crosstalk, frequency response accuracy and other parameters. Virtually every page reveals nuggets of specialized knowledge not found anywhere else. For example, you can improve the offness of a fader simply by adding a resistor in the right place- if you know the right place.
Essential points of theory that bear on practical audio performance are lucidly and thoroughly explained, with the mathematics kept to an absolute minimum. Self’s background in design for manufacture ensures he keeps a wary eye on the cost of things.
This book features the engaging prose style familiar to readers of his other books. You will learn why mercury-filled cables are not a good idea, the pitfalls of plating gold on copper, and what quotes from Star Trek have to do with PCB design.
Learn how to:
- make amplifiers with apparently impossibly low noise
- design discrete circuitry that can handle enormous signals with vanishingly low distortion
- use humble low-gain transistors to make an amplifier with an input impedance of more than 50 megohms
- transform the performance of low-cost-opamps
- build active filters with very low noise and distortion
- make incredibly accurate volume controls
- make a huge variety of audio equalisers
- make magnetic cartridge preamplifiers that have noise so low it is limited by basic physics, by using load synthesis
- sum, switch, clip, compress, and route audio signals
- be confident that phase perception is not an issue
This expanded and updated third edition contains extensive new material on optimising RIAA equalisation, electronics for ribbon microphones, summation of noise sources, defining system frequency response, loudness controls, and much more. Including all the crucial theory, but with minimal mathematics, Small Signal Audio Design is the must-have companion for anyone studying, researching, or working in audio engineering and audio electronics.
Table of contents
- Cover
- Half Title
- Title
- Copyright
- Dedication
- Contents
- Preface
- Acknowledgments
-
Chapter 1 The Basics
- Signals
- Amplifiers
- Negative Feedback
- Nominal Signal Levels and Dynamic Range
- Frequency Response
- Phase Perception
- Gain Structures
- Noise
- Johnson Noise
- Shot Noise
- 1/f Noise (Flicker Noise)
- Popcorn Noise
- Summing Noise Sources
- Noise in Amplifiers
- Noise in Bipolar Transistors
- Noise in JFETs
- Noise Gain
- Low-Noise Opamp Circuitry
- Noise Measurements
- How to Attenuate Quietly
- How to Amplify Quietly
- How to Invert Quietly
- How to Balance Quietly
- Ultra-Low-Noise Design With Multi-Path Amplifiers
- Multiple Amplifiers for Greater Drive Capability
-
Chapter 2 Components
- Conductors
- PCB Track-to-Track Crosstalk
- The Three-Layer PCB
- Impedances and Crosstalk: A Case History
-
Resistors
- Through-Hole Resistors
- Surface-Mount Resistors
- Resistor Series
- Resistor Accuracy: Two-Resistor Combinations
- Resistor Accuracy: Three-Resistor Combinations
- Other Resistor Combinations
- Resistor Value Distributions
- The Uniform Distribution
- Resistor Imperfections
- Resistor Excess Noise
- Resistor Non-Linearity
- Capacitors
- Inductors
-
Chapter 3 Discrete Transistor Circuitry
- Why Use Discrete Transistor Circuitry?
- Bipolars and FETs
- Bipolar Junction Transistors
- The Transistor Equation
- Beta
- Unity-Gain Buffer Stages
-
Gain Stages
- One-Transistor Shunt-Feedback Gain Stages
- One-Transistor Series-Feedback Gain Stages
- Two-Transistor Shunt-Feedback Gain Stages
- Two-Transistor Shunt-Feedback Stages: Improving Linearity
- Two-Transistor Shunt-Feedback Stages: Noise
- Two-Transistor Shunt-Feedback Stages: Bootstrapping
- Two-Transistor Shunt-Feedback Stages as Summing Amplifiers
- Two-Transistor Series-Feedback Gain Stages
- Discrete Opamp Design
- High-Input-Impedance Bipolar Stages
-
Chapter 4 Opamps and Their Properties
- Introduction
- A Very Brief History of Opamps
- Opamp Properties: Noise
- Opamp Properties: Slew Rate
- Opamp Properties: Common Mode Range
- Opamp Properties: Input Offset Voltage
- Opamp Properties: Bias Current
- Opamp Properties: Cost
- Opamp Properties: Distortion
- Selecting the Right Opamp
- Opamps Surveyed: BJT Input Types
- The NE5532/5534 Opamp
- Opamps Surveyed: JFET Input Types
- Chapter 5 Opamps for Low Voltages
-
Chapter 6 Filters
- Introduction
- Passive Filters
- Active Filters
- Low-Pass Filters
- High-Pass Filters
- Combined Low-Pass and High-Pass Filters
- Band-Pass Filters
- Notch Filters
- All-Pass Filters
- Filter Characteristics
- Sallen and Key Low-Pass Filters
- Sallen and Key High-Pass Filters
- Distortion in Sallen and Key Filters
- Multiple-Feedback Band-Pass Filters
- Notch Filters
- Differential Filters
- Chapter 7 Preamplifier Architectures
-
Chapter 8 Variable Gain Stages
- Amplifier Stages With Gain From Unity Upwards: Single-Gain Pot
- Amplifier Stages With Gain From Unity Upwards: Dual-Gain Pot
- Combining Gain Stages With Active Filters
- Amplifier Stages With Gain From Zero Upwards: Single-Gain Pot
- Amplifier Stages With Gain From Zero Upwards: Dual-Gain Pot
- Switched-Gain Amplifiers
-
Chapter 9 Moving-Magnet Inputs: Levels and RIAA Equalisation
- Cartridge Types
- The Vinyl Medium
- Spurious Signals
- Other Vinyl Problems
- Maximum Signal Levels From Vinyl
- Moving-Magnet Cartridge Sensitivities
- Overload Margins and Amplifier Limitations
- Equalisation and Its Discontents
- The Unloved IEC Amendment
- The “Neumann Pole”
- MM Amplifier Configurations
- Opamp MM Input Stages
- Calculating the RIAA Equalisation Components
- Implementing RIAA Equalisation
- Implementing the IEC Amendment
- RIAA Series-Feedback Network Configurations
- RIAA Optimisation: C1 as a Single E6 Capacitor, 2xE24
- RIAA Optimisation: C1 as 3 x 10 nF Capacitors, 2xE24
- RIAA Optimisation: C1 as 4 x 10 nF Capacitors, 2xE24
- RIAA Optimisation: The Willmann Tables
- RIAA Optimisation: C1 as 3 x 10 nF Capacitors, 3xE24
- RIAA Optimisation: C1 as 4 x 10 nF Capacitors, 3xE24
- Switched-Gain MM RIAA Amplifiers
- Switched-Gain MM/MC RIAA Amplifiers
- Open-Loop Gain and RIAA Accuracy
- Passive and Semi-Passive RIAA Equalisation
- MM Cartridge Loading and Frequency Response
- MM Cartridge–Preamplifier Interaction
- MM Cartridge DC and AC Coupling
- Noise in MM RIAA Preamplifiers
- Hybrid MM Amplifiers
- Balanced MM Inputs
- Noise in Balanced MM Inputs
- Noise Weighting
- Noise Measurements
- Cartridge Load Synthesis for Lower Noise
- Subsonic Filters
- Ultrasonic Filters
- A Practical MM Amplifier #3
- Chapter 10 Moving-Coil Head Amplifiers
- Chapter 11 Tape Replay
- Chapter 12 Guitar Preamplifiers
-
Chapter 13 Volume Controls
- Volume Controls
- Volume Control Laws
- Loaded Linear Pots
- Dual-Action Volume Controls
- Tapped Volume Controls
- Slide Faders
- Active Volume Controls
- The Baxandall Active Volume Control
- The Baxandall Volume Control Law
- A Practical Baxandall Active Volume Stage
- Low-Noise Baxandall Active Volume Stages
- The Baxandall Volume Control: Loading Effects
- An Improved Baxandall Active Volume Stage With Lower Noise
- Baxandall Active Volume Stage Plus Passive Control
- The Overlap Penalty
- Potentiometers and DC
- Belt-Ganged Volume Controls
- Motorised Potentiometers
- Stepped Volume Controls
- Switched Attenuator Volume Controls
- Relay-Switched Volume Controls
- Transformer-Tap Volume Controls
- Integrated Circuit Volume Controls
- Loudness Controls
- The Newcomb and Young Loudness Control
- Chapter 14 Balance Controls
-
Chapter 15 Tone Controls and Equalisers
- Introduction
- Passive Tone Controls
- Baxandall Tone Controls
- Variable-Frequency HF EQ
- Variable-Frequency LF EQ
- A New Type of Switched-Frequency LF EQ
- Variable-Frequency HF and LF EQ in One Stage
- Tilt or Tone-Balance Controls
- Middle Controls
- Switchable Peak/Shelving LF/HF EQ
- Parametric Middle EQ
- Graphic Equalisers
- Chapter 16 Mixer Architecture
-
Chapter 17 Microphone Preamplifiers
- Microphone Types
- Microphone Preamplifier Requirements
- Transformer Microphone Inputs
- The Simple Hybrid Microphone Preamplifier
- The Balanced-Feedback Hybrid Microphone Preamplifier (BFMA)
- Microphone and Line Input Pads
- The Padless Microphone Preamplifier
- Capacitor Microphone Head Amplifiers
- Ribbon Microphone Amplifiers
-
Chapter 18 Line Inputs
- External Signal Levels
- Internal Signal Levels
- Input Amplifier Functions
- Unbalanced Inputs
- Balanced Interconnections
- The Advantages of Balanced Interconnections
- The Disadvantages of Balanced Interconnections
- Balanced Cables and Interference
- Balanced Connectors
- Balanced Signal Levels
- Electronic Versus Transformer Balanced Inputs
- Common Mode Rejection
- Opamp Frequency Response Effects
- Opamp CMRR Effects
- Amplifier Component Mismatch Effects
- A Practical Balanced Input
-
Variations on the Balanced Input Stage
- Combined Unbalanced and Balanced Inputs
- The Superbal Input
- Switched-Gain Balanced Inputs
- Variable-Gain Balanced Inputs
- Combined Line Input and Balance Control Stage With Low Noise
- The Self Variable-Gain Line Input
- High Input-Impedance Balanced Inputs
- The Inverting Two-Opamp Input
- The Instrumentation Amplifier
- Instrumentation Amplifier Applications
- The Instrumentation Amplifier With 4x Gain
- The Instrumentation Amplifier at Unity Gain
- The Instrumentation Amplifier and Gain Controls
- The Instrumentation Amplifier and the Whitlock Bootstrap
- Transformer Balanced Inputs
- Input Overvoltage Protection
- Low-Noise Balanced Inputs
- Low-Noise Balanced Inputs in Action
- Ultra-Low-Noise Balanced Inputs
-
Chapter 19 Line Outputs
- Unbalanced Outputs
- Zero-Impedance Outputs
- Ground-Cancelling Outputs: Basics
- Ground-Cancelling Outputs: Zero-Impedance Output
- Ground-Cancelling Outputs: CMRR
- Ground-Cancelling Outputs: Send Amplifier Noise
- Ground-Cancelling Outputs: Into a Balanced Input
- Ground-Cancelling Outputs: History
- Balanced Outputs: Basics
- Balanced Outputs: Output Impedance
- Balanced Outputs: Noise
- Quasi-Floating Outputs
- Transformer Balanced Outputs
- Output Transformer Frequency Response
- Output Transformer Distortion
- Reducing Output Transformer Distortion
- Chapter 20 Headphone Amplifiers
- Chapter 21 Signal Switching
-
Chapter 22 Mixer Sub-Systems
- Mixer Bus Systems
- Input Arrangements
- Equalisation
- Insert Points
- How to Move a Circuit Block
- Faders
- Post-Fade Amplifiers
- Direct Outputs
- Panpots
- Routing Systems
- Auxiliary Sends
- Group Module Circuit Blocks
- Summing Systems: Voltage Summing
- Summing Systems: Virtual-Earth Summing
- Balanced Summing Systems
- Ground-Cancelling Summing Systems
- Distributed Summing Systems
- Summing Amplifiers
- Hybrid Summing Amplifiers
- Balanced Hybrid Summing Amplifiers
- Balancing Tracks to Reduce Crosstalk
- The Multi-Function Summing Amplifier
- PFL Systems
- AFL Systems
- Solo-in-Place Systems
- Talkback Microphone Amplifiers
- Line-Up Oscillators
- The Flash Bus
- Power Supply Protection
- Console Cooling and Component Lifetimes
- Chapter 23 Level Indication and Metering
- Chapter 24 Level Control and Special Circuits
-
Chapter 25 Power Supplies
- Opamp Supply Rail Voltages
- Designing a ±15 V Supply
- Designing a ±17 V Supply
- Using Variable-Voltage Regulators
- Improving Ripple Performance
- Dual Supplies From a Single Winding
- Power Supplies for Discrete Circuitry
- Larger Power Supplies
- Mutual Shutdown Circuitry
- Very Large Power Supplies
- Microcontroller and Relay Supplies
- +48 V Phantom Power Supplies
- Chapter 26 Interfacing With the Digital Domain
- Appendix
- Index
Product information
- Title: Small Signal Audio Design, 3rd Edition
- Author(s):
- Release date: April 2020
- Publisher(s): Focal Press
- ISBN: 9781000050448
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