Noise elimination requires the system to be connected correctly

In the audio system, there are many devices generally used, and different devices have different interface forms, and the connectors used are different. There are balanced and unbalanced input and output forms. In order to effectively shield the external electromagnetic radiation interference, shielded cables must be used uniformly and connected in the correct way.

It is well known that when the audio signal transmission adopts the balanced transmission mode, the common mode interference level generated by the external interference source for each of the two signal lines in the cable is almost equal to the ground loop, and is input to the internal amplifier of the device. The common mode voltages on the two signal lines will be replaced by differential mode voltages and will not be able to form a mutual interference voltage. Therefore, you should use a balanced connection as much as possible.

When connecting to an unbalanced output device, use a single-core shielded cable to connect the port of the balanced device to the port of the unbalanced device without using a balanced-unbalanced converter. The noise induced by the shield is mixed into the audio signal. Medium, thereby increasing noise, which will be a major way to introduce noise. The correct approach is to use a double-core shielded cable, whether balanced or unbalanced, and the shield is only grounded at the end of the balanced output or input.

When the two ends are unbalanced devices, if the transmission distance is long, it is better to use a balanced, unbalanced converter or audio isolation transformer to convert to balanced transmission.

The connection of current audio equipment is generally connected by voltage crossover, that is, the line output of all audio equipments is a low-impedance output, and the line input of the load is a high-impedance input. In addition to the connection of the amplifier and the speaker, there is generally no need to specifically consider impedance matching. Zhejiang Media College Wang Jianlin

Bridge rectifiers

A Bridge rectifier is an Alternating Current (AC) to Direct Current (DC) converter that rectifies mains AC input to DC output. Bridge Rectifiers are widely used in power supplies that provide necessary DC voltage for the electronic components or devices. They can be constructed with four or more diodes or any other controlled solid-state switches.

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