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Barrel - Audio Connectors

Barrel audio connectors are used in a variety of applications, most typically as audio input/output connectors on many consumer products, such as electronic musical instruments, portable audio players, and home theater systems. They are also often used for speaker connections and signal wire distribution. The barrel audio connectors are typically cylindrical in shape and have 2 or more contacts with a diameter range of 1/4 inch to 3/4 inch. The contact arrangement is usually made from an insulating material such as plastic or rubber, while the contacts are typically made from metal and are soldered or screwed into the housing.

740 Application Field & Working Principle

The most common application of barrel audio connectors is for the connection of electrical signals between different components. The contacts in the connector ensure that any given signal is received on the corresponding contact of the other device. In cases where the devices are powered, a 3rd contact may be used as a power source to provide the devices with power. In some cases, the contacts may be used for digital data transfer as with the IEEE 1394 Firewire connection.

The working principle of the barrel audio connector is very simple yet effective. The contacts present in the connector are arranged such that when they are connected with each other, the electrical signals can get transferred from one device to the other. The contacts ensure that the electrical signals only travel in one direction and the signal integrity is maintained at all times. As mentioned earlier, a 3rd contact may be used to provide power to the devices in questions. Hence, the barrel audio connector becomes a very important interface between electronic devices.

The contact arrangement of the barrel audio connector can be designed to either be non-polarized or polarized. In a polarized connector, the contacts are arranged such that the current only flows in one direction. This is especially useful when the signal is DC powered, which can be potentially hazardous if allowed to flow in the wrong direction. The contacts on these types of connectors may be staggered in a specific pattern so as to ensure that the connector is connected in the right direction.

In addition to audio input/output, barrel audio connectors can be used in a variety of other applications. They can be used to connect antennae to receivers, act as signal connectors for lighting rigs, and can even be used in the home to provide a connection between two separate devices such as a television and a sound bar. Because these types of connectors are so simple and reliable, they continue to be widely used in a variety of applications.

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