Key switch working principle, classification, application and matters needing attention

February 28, 2023

Electronic switch is one of the key components in modern circuit, and the key switch is one of the most basic forms of electronic switch. This article will discuss the working principle, classification, application and some possible problems of the key switch.

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First, let's understand how the key switch works. A key switch is a mechanical switch that turns a circuit on or off by pressing or releasing a button. These buttons consist of a spring and a contact point. When the button is pressed, the spring is compressed, the contact point closes, and the circuit closes. When the button is released, the spring springs back, the contact point separates, and the circuit returns to the open state. Therefore, the key switch can be used to control the switching state of the circuit.

There are many kinds of key switches, common including push type, rotary type, toggle type and sliding type. Push-button switches, which turn a circuit on or off by pressing a button, are the most common type. Rotary key switches are used to control the on-off state of a circuit by rotating a button, and are commonly used in applications such as volume controllers, power switches, and selectors. Toggle button switches switch the state of a circuit by flipping a button, such as the button on a video game controller. Sliding-button switches, which slide a button to turn a circuit on or off, are commonly found on mobile devices such as phones and tablets.

Key switches are widely used in many applications. For example, we often use electronic calculators, remote controls, computer keyboards, mice and other devices have key switches. In addition, key switches are also used in automobiles, home appliances, medical equipment and other applications. No matter what kind of application, the key switch can play a role in controlling the switching state of the circuit, so that the device can work normally.

However, there may be some problems with the key switch. One of the most common problems is poor contact, which can cause the circuit to fail to open or close properly. In addition, the spring of the key switch may also be damaged or deformed, causing the key to not spring properly. In addition, long-term use may also lead to switch failure. In this case, the key switch needs to be replaced to ensure the proper operation of the device.

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In short, the key switch is the most basic form of electronic switch, by pressing or releasing the button to control the switching state of the circuit. There are many types of key switches, widely used in a variety of devices. However, it may also have some problems that need to be dealt with in a timely manner.

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