Causes and solutions of key switch jitter

Classification：Key switch news

Author: AUGO Electronics

Release date：2022-02-20 18:37:30

The key switch has the advantages of small contact resistance load, accurate operating force error, and diversified specifications, and has been widely used in electronic equipment and white goods. The main uses of key switches are color TV sets, black and white TV sets, audio equipment, video recorders, video cameras, computers, game consoles, fax machines, walkie-talkies, batons, machine tool control devices, copiers, printers, electronic instruments, meters and other household appliances. In the process of use, the key switch will inevitably have some failures, such as the jitter problem we are going to talk about today, what is the reason for the jitter of the key switch? How to solve it?
The reason for the strong jitter of the key switch: The scanning frequency of the dynamic display should not be less than 25Hz in theory, and it usually needs to be above 30Hz to show the actual effect. When you don't press the button, it indicates that everything is normal. After pressing the button, it will shake. It is because the scanning frequency can reach the specified requirement when you do not press the button. The law meets the requirements, resulting in a "jitter" condition.
The solution to the jitter of the key switch: The key to solving the problem is how to reduce the operation time of the key program, so as to ensure that the scanning program can scan on time. It is proposed to place the program of the scan indication part in the termination resolution part of the timer, which can ensure the scanning frequency, and change the delay in the program of the key resolution part to be terminated on time.

How to choose the size of the key switch
The size of the key switch determines the performance of the key switch. Many times we want to choose a better key switch to use, which will make our key switch use longer and not be troubled by replacing the key switch. If there is a problem with the switch, the damage of the key switch will bring us a lot of inconvenience.
Therefore, the choice of the size of the key switch is also what many people want, many people consider, a topic that many people must consider, a topic that can never be avoided, so how to choose the size of the key switch? This problem is actually a very simple problem for some professionals. If it is not very professional to face this problem, it will be a more complicated problem. The choice of the size of the key switch is mainly based on The use environment of the key switch is determined.
For example, the environment where your key switch is used is a relatively large living environment, then you can choose some relatively large key switches during the use of the key switch. If the use environment of the key switch is a relatively small environment, You can choose some smaller safety switches to use, which will be better. Only in this way can the use effect of the key switch and the matching effect of the environment be met.

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