Key Features
- Type: Active Buzzer
- Self-Driven: Contains a built-in oscillation circuit, meaning it produces a continuous, fixed-frequency tone (usually approx 2.5kHz to 4kHz) simply by applying a DC voltage.
- Ease of Use: Unlike a passive buzzer, it does not require a complex PWM (Pulse Width Modulation) signal from a microcontroller to generate a sound; it is simple ON/OFF control.
- Voltage Range (Typically Wide):
- While specific models (like SFM-27) may have a Rated Voltage of 12V, they usually operate across a wide DC range, commonly 3V to 24V.
- Sound Output:
- Designed for loud alerts, with a typical Sound Pressure Level (SPL) of ge 85dB to ge 95dB (decibels).
- The sound type is usually continuous or may be intermittent (a rapid sequence of beeps), depending on the specific model variation.
- Current Consumption:
- Relatively low, often less than 12mA to 30mA, making it energy-efficient.
- Physical Specifications:
- The “27” in the name often refers to the approximate diameter or size of the unit (e.g., a 27mm diameter housing).
- Features two terminals for easy connection (positive V+ and negative GND), with polarity required for proper operation.
Common Applications
- Alarm Systems: Used as loud sounders for burglar alarms, fire alarms, or security panels.
- Timers: Providing an audible notification when a countdown or process is complete.
- Automotive/Industrial: Used in vehicles or machinery for warning signals or operational status alerts.
- DIY Electronics: Incorporated into projects with microcontrollers (like Arduino) for simple audio feedback or error signaling.
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