By R. M. Marston
Audio IC Circuits guide is a single-volume functional «user» details and circuitry advisor to the preferred and worthy of audio and audio-associated built-in circuits. This publication offers with ICs resembling low frequency linear amplifiers, twin pre-amplifiers, audio strength amplifiers, charged-coupled equipment hold up traces, bar-graph reveal drivers, and gear provide regulators. This publication is split into seven chapters that concentrate on the appliance of those units in circuits starting from basic sign conditioners and filters to complicated image equalizers, stereo amplifier structures, and echo/reverb hold up line structures. Chapters 1 to four take care of natural «audio» matters, resembling audio processing circuits, audio pre-amplifier circuits, and audio energy amplifier circuits. Chapters five and six give some thought to audio-associated matters of light-emitting diode bar-graph screens, and CCD delay-line circuits. bankruptcy 7 bargains with energy offer circuits to be used in audio structures. This handbook is meant essentially to layout engineers, technicians, and digital scholars. Contents Prefacevii 1. Audio processing circuits 1 2. Audio pre-amplifier circuits forty six three. Audio energy amplifier circuits sixty five four. High-power audio amplifiers ninety one five. LED bar-graph monitors 112 6. CCD audio delay-line circuits 132 7. strength offer circuits 154 Index 166
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43 shows the typical signal distortion figures obtained from the L M 13600 when used with a n d without the internal linearizing diodes. 02% distortion with the diodes, but about 0 . 5% respectively at 40 m V input. 4 μΑ to 527 μΑ. In this type of application the input bias levels of the IC must be balanced so that the output dc level does not shift as the gain is varied, and this is achieved via offset-nulling preset pot R Vx. T o set up the circuit, set RV2 to its minimum (maximum gain) value, and then trim RVi to give zero dc output.
At lower gains an external capacitor can be wired in parallel with Ci to provide suitable compensation. The output stage of the amplifier comprises Darlington emitter follower Q s - Q q , which is provided with an active current sink via Q 7 . Transistor Q 1 0 provides short-circuit protection by limiting the o u t p u t current to 12 m A . The biasing network of the amplifier is designed to give a very high supplysignal rejection ratio (120 dB), and consists essentially of very high impedance constant-current generator Qx i - Q i 2 - Q i 3 , which is used to generate a ripplefree reference voltage across zener diode Z D 2 .
B i as can thus be obtained by simply connecting pin-5 to either the c o m m o n rail or the positive supply rail via a current-limiting resistor of suitable value. 40 shows a simple but instructive way of using the CA3080 as an ac-coupled inverting amplifier with a voltage gain of a b o u t 40 d B . 4 V are generated across bias resistor R3, which thus feeds roughly 500 μΑ into pin-5 and thus causes the IC to consume 1 m A (20 times / b i a )s from its supply rails. 40 ac-coupled 40 dB inverting amplifier At a bias current of 500 μ A the gm of the CA3080 is about 10 mS.