A buzzer is a common sound device that can produce a buzzing sound through vibration. A buzzer usually consists of a vibrating plate and a vibrating circuit, which controls the frequency and current of the oscillation between them to produce different tones and loudness.
Buzzers are commonly used in various electronic devices, such as alarm clocks, mobile phones, computers, electronic games, etc. Before using the buzzer, we need to set some parameters to ensure that it can work properly and produce the desired sound. Next, we will discuss in detail the parameter settings of the buzzer.
- Vibration frequency (Hz): Vibration frequency refers to the frequency of the buzzer’s vibration, which determines the pitch of the sound emitted. Normally, the operating frequency range of a buzzer is 2kHz to 4kHz, where 2kHz corresponds to bass and 4kHz corresponds to treble. By adjusting the components in the oscillation circuit, such as resistors, capacitors, transistors, etc., the oscillation frequency of the buzzer can be changed.
- Current (mA): Current refers to the intensity of the current passing through the buzzer, which determines the loudness of the sound produced. The working current of the buzzer is usually between 10mA and 30mA, and the current is controlled by adjusting the power supply voltage and resistance in the circuit. A higher current will produce a louder sound, but it will also increase the power consumption of the buzzer.
- Drive mode: The buzzer can adopt different drive modes, such as DC drive and Pulse drive. In DC drive mode, the frequency at which the current passes through the buzzer without changing is usually used for continuous sound production. In pulse drive mode, the current is switched at a specific frequency to generate pulse sound effects.
- Control signal: The buzzer can activate or deactivate its sound through external control signals. When the control signal is at high level, the buzzer works and emits a sound; When the control signal is low, the buzzer stops sounding. This control signal can be provided by a microcontroller or other logic circuit and controlled through pins connected to the buzzer.
- Driver power supply: The buzzer needs to be powered by a power supply to function. Normally, the working voltage range of a buzzer is 3V to 12V, depending on the model and specifications of the buzzer. To ensure the normal operation of the buzzer, we need to correctly connect the driver power supply to the positive and negative poles of the buzzer.
The above is some basic knowledge about setting the parameters of the buzzer. In practical applications, we need to make reasonable parameter selection and adjustment based on specific requirements and the specifications of the buzzer to achieve the desired sound effect. At the same time, pay attention to the working temperature range of the buzzer to avoid exceeding its tolerance range, so as not to affect the lifespan and performance of the buzzer.