By R. M. Marston
Audio IC Circuits handbook is a single-volume useful «user» details and circuitry consultant to the preferred and necessary of audio and audio-associated built-in circuits. This publication bargains with ICs corresponding to low frequency linear amplifiers, twin pre-amplifiers, audio strength amplifiers, charged-coupled machine hold up traces, bar-graph reveal drivers, and gear offer regulators. This e-book is split into seven chapters that concentrate on the appliance of those units in circuits starting from easy sign conditioners and filters to advanced photograph equalizers, stereo amplifier platforms, and echo/reverb hold up line structures. Chapters 1 to four take care of natural «audio» matters, akin to audio processing circuits, audio pre-amplifier circuits, and audio energy amplifier circuits. Chapters five and six contemplate audio-associated matters of light-emitting diode bar-graph screens, and CCD delay-line circuits. bankruptcy 7 bargains with strength provide circuits to be used in audio platforms. This handbook is meant basically to layout engineers, technicians, and digital scholars. Contents Prefacevii 1. Audio processing circuits 1 2. Audio pre-amplifier circuits forty six three. Audio strength amplifier circuits sixty five four. High-power audio amplifiers ninety one five. LED bar-graph screens 112 6. CCD audio delay-line circuits 132 7. energy offer circuits 154 Index 166
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Input signals ac coupled to pin 2 (or 15) are full wave rectified and fed to pin 1 (or 16), where they can be smoothed by an external capacitor to generate a VCA control voltage on this pin. Input signals ac coupled to pin 3 (or 14) are fed to the input of the variable gain block, which is a precision temperate-compensated VCA with its gain controlled via the pin 1 (or 16) voltage; its output is fed to the inverting input of the I C s o p - a m p stage. Gain block signal distortion is quite low, and can be minimized by feeding a 'trim' voltage to pin 8 (or 9).
An automatic gain control amplifier T h e gain of the L M 13600 O T A can be varied by altering either its 7 b i as or 7 D current. 52 shows how 7 D variation can be used to make an automatic gain control ( A G C ) amplifier in which a 100:1 change in input signal amplitude causes only a 5:1 change in output amplitude. 52 Circuit and performance table of an AGC amplifier Audio processing circuits 39 In this circuit, / b i as is fixed by R4, and the o u t p u t signal is taken directly from the O T A via R5.
Both ICs are housed in 16-pin D I L packages. 57 lists the basic characteristics of the two ICs. N o t e in the block diagram (and in following circuits) that pin numbers relating to the left-hand channel of the IC are shown in plain numbers, and those relating to the right-hand half are shown in bracketed numbers. 56 block diagram are fairly easy to understand. Input signals ac coupled to pin 2 (or 15) are full wave rectified and fed to pin 1 (or 16), where they can be smoothed by an external capacitor to generate a VCA control voltage on this pin.
Audio IC Circuits Manual by R. M. Marston