Piezo Electric Buzzer Alarm 3V-24V Continuous Sound B-27 Industrial Grade

Specifications:

• Model: B-27 (Industrial Grade)
  
• Sound Type: Continuous High-Pitch Tone
  
• Operating Voltage: 3V to 24V DC
  
• Rated Voltage: 12V DC
  
• Max Rated Current: 12mA at 12VDC
  
• Sound Pressure Level (SPL): ≥95 dB at 10cm distance (at 12VDC)
  
• Resonant Frequency: 3100 ± 500 Hz
  
• Mounting Type: Dual-hole flange mount
  
• Mounting Hole Spacing: 40mm
  
• Dimensions: 30mm Diameter x 15mm Height
  
• Operating Temperature: -20°C to +60°C

Key Applications

• Industrial Safety: Fault alarms for PLC control panels and CNC machinery.
  
• Automotive Alerts: Reverse parking sensors, blinker reminders, or door-ajar indicators.
  
• Security Systems: High-pitch sirens for home security modules and shop shutters.
  
• Home Automation: Doorbell chime or appliance completion alerts for washing machines.
  
• DIY Robotics: Critical low-battery indicators for drones and heavy-duty rovers.

Project Evolution

• Past Projects (Prerequisites): Basic experience with 5V active buzzers and DC wiring.
  
• Feature Upgrade: Transition from low-power 5V beeps to high-decibel (95dB) industrial signaling with 24V compatibility.
  
• Effort/Requirements: Beginner. Requires a DC power source or a simple transistor switch for logic control.

Virtual Technician & Wiring

• ⚠️ Warning: Do not exceed 24V DC. For logic-level control (3.3V/5V), always use a transistor/MOSFET.
• Red Wire: Positive (+) 3V-24V DC
• Black Wire: Negative (-) Ground/GND
• Installation: Use M3 screws to mount the flanges to a rigid surface for maximum acoustic resonance.

Package Includes:

1 x Piezo Electric Buzzer Alarm 3V-24V Continuous Sound B-27 Industrial Grade

Frequently Asked Questions (FAQ)

1. What is the maximum voltage for B-27?
   It safely operates up to 24V DC.
2. Does this buzzer require a library for Arduino?
   No, it is an active buzzer; just provide power.
3. Can I use this with a 3.3V ESP32?
   Yes, it starts sounding at 3V, though it will be quieter than at 12V.
4. Is the sound continuous or intermittent?
   This model produces a steady, continuous tone.
5. How loud is 95dB?
   It is roughly equivalent to a loud motorcycle engine or a power lawnmower.
6. Can I change the pitch?
   No, the frequency is fixed at 3100Hz by the internal driver.
7. Is it waterproof?
   It is splash-resistant but not rated for immersion.
8. What is the current draw at 24V?
   Typically around 15-20mA.
9. Can I power this directly from an Arduino pin?
   It is recommended to use a transistor to handle the current/voltage, especially above 5V.
10. How do I mount this buzzer?
    Use the two side flanges with M3 screws.
11. What is the distance between mounting holes?
    Exactly 40mm.
12. Will it work with AC power?
    No, this is a DC-only component.
13. Is it compatible with 12V car batteries?
    Yes, it is perfect for automotive 12V systems.
14. Does it make a click sound when starting?
    No, it has a smooth start-up.
15. Can I use PWM to control the volume?
    Limited volume control is possible with PWM, but it may affect tone stability.
16. What happens if I reverse the wires?
    The buzzer simply won't sound; it will not be damaged.
17. Is this a piezo or electromagnetic buzzer?
    It is a Piezoelectric buzzer.
18. Can I use this as a microphone?
    No, the internal circuitry prevents it from being used as a sensor.
19. What is the resonant frequency?
    3100Hz ± 500Hz.
20. Can I use this with a Raspberry Pi?
    Yes, via a transistor or relay module.