Small-Signal Audio Design

Small Signal Audio Design is a unique guide to the design of high-quality circuitry for preamplifiers, mixing consoles, and a host of other signal-processing devices. Learn to use inexpensive and readily available parts to obtain state-of-the-art performance in all the vital parameters of noise, distortion, crosstalk and so on. Focusing mainly on preamplifiers and mixers this practical handbook gives you an extensive repertoire of circuits that can be put together to make almost any type of audio system.
A resource packed full of valuable information, with virtually every page revealing nuggets of specialized knowledge never before published. Essential points of theory that bear on practical performance are lucidly and thoroughly explained, with the mathematics kept to an essential minimum. Douglas' background in design for manufacture ensures he keeps a wary eye on the cost of things. Includes a chapter on power-supplies, full of practical ways to keep both the ripple and the cost down, showing how to power everything.

Douglas wears his learning lightly, and this book features the engaging prose style familiar to readers of his other books The Audio Power Amplifier Design Handbook and Self on Audio. You will learn why mercury 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.

*Provides an enormous amount of knowledge in one unique volume, making it an essential guide to design principles and practice in the wide are of small-signal audio

*Includes numerous circuit blocks with all component values given so you can build on them and easily adapt them to your own requirements

*Lavishly illustrated with diagrams and graphs, and full of practical measurements on real circuitry so you can be sure just how well it will perform


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, how to make 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


sum, switch, clip, compress, and route audio signals

CHAPTER 1: SYSTEM ARCHITECTURES CHAPTER 1part 2: SPECIFICATION REQUIREMENTS CHAPTER 2: COMPONENTS CHAPTER 3: BASIC TECHNIQUES OF NEGATIVE FEEDBACK & LOW NOISE CHAPTER 3 part 2: DESIGN WITH DISCRETE TRANSISTORS CHAPTER 4: DESIGN WITH OPAMPS CHAPTER 5: SIGNAL SWITCHING CHAPTER 6: LINE INPUTS & OUTPUTS CHAPTER 7: MOVING-MAGNET DISC INPUTS CHAPTER 8: MOVING-COIL DISC INPUTS CHAPTER 9: MICROPHONE INPUTS CHAPTER 10: TONE CONTROLS & FILTERS CHAPTER 11: FILTERS CHAPTER 12: VOLUME-CONTROL & BALANCE CHAPTER 13: MIXER SUBSYSTEMS CHAPTER 14: ELECTRONIC CROSSOVERS CHAPTER 15: LEVEL CONTROL & SPECIAL PROCESSING CIRCUITS CHAPTER 16: METERING, MUTING & RELAY CONTROL CHAPTER 17: POWER SUPPLIES CHAPTER 18: ANALYSIS OF THE MRP 11 PREAMPLIFIER CHAPTER 19: ANALYSIS OF THE 200 DELTA MIXER