The buzzer in the infrared sensor circuit only rings a few times because of the circuit design.
In the infrared sensor circuit, the sound of the buzzer is usually controlled by the trigger.
When the infrared sensor detects an object, the trigger is activated, which causes the buzzer to sound. However, to avoid constant ringing, designers often set up a time delay that stops the buzzer after only a few sounds.
Such a design can avoid the constant sound of the buzzer, saving energy and reducing interference to the user.
In addition, by adjusting the parameters of the time delay, you can control the duration and frequency of the buzzer to adapt to different application scenarios and requirements. For example, in a security system, a brief beep can be used to alert people that someone is approaching or entering a protected area.
The buzzer in the infrared induction circuit is controlled by the control chip, which is so loud when it is designed.