Cover -- Half Title -- Title -- Copyright -- Contents -- Preface to the second edition -- 1 Revision of electricity - d.c. -- 1.1 Electricity - what is it? -- 1.2 Amperes, volts and ohms -- 1.3 Power and watts -- 1.4 Ideas about magnetism -- 1.5 Magnetic fields and electric currents -- 1.6 Currents in coils -- 1.7 Protecting equipment - fuses -- 1.8 Batteries -- Some prefixes -- Definitions -- 2 Revision of electricity - a.c. -- 2.1 The 'shape' of an alternating current -- 2.2 Important quantities -- 2.3 Phase angles -- 2.4 Three-phase supplies -- 2.5 Mains plugs -- 2.6 Safety devices -- 2.7 Transformers -- 2.8 Meters for a.c. -- 2.9 Capacitors -- 2.10 Inductors -- 2.11 Trigonometry -- 3 Outlines of electronic devices -- 3.1 Semiconductors and thermionic devices -- 3.2 Miscellaneous -- 4 Radio transmission -- 4.1 Radio waves -- 4.2 The electromagnetic spectrum -- 4.3 Amplitude modulation (a.m.) -- 4.4 Frequency modulation (f.m.) -- 4.5 Other modulation systems -- 5 Decibels -- 5.1 What are they? -- 5.2 A definition -- 6 Sound waves -- 6.1 Types of wave -- 6.2 Sound wavelengths and frequencies -- 6.3 Sound waves and obstacles -- 6.4 The inverse square law -- 6.5 Sound in pipes -- 6.6 Harmonics, etc. -- 6.7 What is a musical sound? -- 7 The ear and hearing -- 7.1 The ear's response to sounds -- 7.2 Loudness -- 7.3 Hearing damage -- 7.4 Pitch -- 7.5 A word of caution -- 8 Basic acoustics -- 8.1 What do we mean by good acoustics? -- 8.2 Avoiding resonances -- 8.3 Reverberation -- 8.4 Sound isolation -- 9 Microphones -- 9.1 The basic parts of a microphone -- 9.2 Transducers -- 9.3 The important responses of a microphone -- 9.4 Microphone applications -- 9.5 Microphone faults -- 10 More about microphones -- 10.1 Phantom power -- 10.2 Phase in microphones -- 10.3 Microphone cables, plugs and sockets -- 10.4 Variable polar diagram microphones