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Consumer Electronics by S. P. Bali

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LAYOUT OF HIGH-QUALITY AUDIO CIRCUITRY

The circuits for high-quality reproduction function only as they should if they are carefully laid out and constructed. The relative positions of input, and power supply, and the earthing and screening arrangements are of particular importance, and it is suggested that layouts should be designed with reference to the code of good practice outlined here.

General Layout : The input sensitivity of an amplifier is typically 3 mV at 1 kHz on the magnetic pickup position, and the output voltage is of the order of 20V, implying a voltage gain approaching 104. It is therefore essential to keep the output separated and screened from the input. The magnetic field from the mains transformer may cause hum, so the mains ...

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