By R. M. Marston
Audio IC Circuits handbook is a single-volume functional «user» details and circuitry advisor to the most well-liked and helpful of audio and audio-associated built-in circuits. This e-book offers with ICs similar to low frequency linear amplifiers, twin pre-amplifiers, audio strength amplifiers, charged-coupled gadget hold up traces, bar-graph show drivers, and tool offer regulators. This booklet is split into seven chapters that concentrate on the appliance of those units in circuits starting from easy sign conditioners and filters to advanced image equalizers, stereo amplifier structures, 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 strength amplifier circuits. Chapters five and six contemplate audio-associated topics of light-emitting diode bar-graph screens, and CCD delay-line circuits. bankruptcy 7 offers with strength offer circuits to be used in audio structures. 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 energy 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. strength offer circuits 154 Index 166
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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. 44 33 Variable gain ( χ 5 to χ WO) ac amplifier 5 of the CA3080 via a 33 k series resistor. In this case the circuit gives a gain of χ 100 when Vm equals the positive supply rail value, and near-zero gain when K in is 600 mV above the negative supply rail value.
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). 8 V precision reference; the inverting input is connected to the gain block output, is externally available, and is also connected to the R3-R4 resistor network.
32, so that a linear overall record-to-replay response is obtained. 34 shows a practical example of a modern low-noise p h o n o pre-amplifier with integral R I A A magnetic-pickup equalization. RIAA phono pre-amp Magnetic pickups are low-sensitivity devices, and give typical midband outputs of only a few millivolts. 34 circuit is thus designed around LM381 Audio processing circuits 25 or LM387 ICs of this type. These are 'dual' ICs, and in the diagram the pin numbers of one half of the IC are shown in plain numbers, and the other half are shown in brackets.