【 Weak current College 】 wiring technology — sound knowledge of the distribution of ground

Sound engineering is the layout of the home theater's key projects, is also set KTV rooms system key. Here we introduce you to sound and cabling technologies for the distribution of sound in the ground.

First, the sound ground distribution of attention to detail

①, some circuit both small signal inputting port, and a large signal output, input, output and usually by Panel of delivery. If the input and output locations are received, their respective end-to-be sure to ground wire to the common ground, not share an Earth wire.

②, if the actual circuit in the Budd received, the grounding element at all levels, it is not possible to these components are put into a thread holes, but as far as possible, the nearest congresses at the grounding element arrangement in a section of the public ground wire or a region, you can also leads from the ground-ground branch or grounding island.

③, ground layout reasonable or not decision: whether the ground of the current flowing through the current-independent of other circuits or components.

④, arranging high power audio output level, because the output power block and filtering electrolytic capacitors, etc. larger components required on board, it should be some element of Earth point and at the ground of the internal components to do a little ground.

⑤, ground wire distribution should be to address current, both disparate current cannot be combined with a piece of ground, allowing a ground wire in current cannot be used to separate the ground wire.

Second, when there are a variety of signal transduction and output wires to the plate in the wiring, in order to prevent parasitic coupling, should do the following:

①, signal lines in the layout to avoid when arranged by parallel each other, especially in the handling of cross-line and double-sided printing, you must pay attention to both sides of the wire is vertical or cross, unequal;

②, levels of signal alignment as short as possible;

③, encountered a plate of signal internal demand equality, should make these wire conductors as clearance distance, or a separate ground wire, power cable, shielding purposes;

Printed conductors in addition to its own existence of inductance and resistance, in wire audio and there was mutual inductance and capacitance. When the circuit more frequently or current is large, similarly to other parts of interfering, we take that as a wire between the distribution parameters cause unwanted coupling that this parasitic coupling interference.

④, are arranged in all levels of the circuit, to follow the signals listed in the order in which they could not arrange detour or level so that you can avoid all levels between signal lines across each other;