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DC 3-24V 12V 2-Wire Intermittent Active Electronic Buzzer Alarm White SFM-27

95DB Alarm DC 3-24V SFM-27 Electronic Buzzer Passive Continuous Piezoelectric
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Description

Elevate your alerts with the DC 3-24V 12V 2-Wire Intermittent Active Electronic Buzzer Alarm in Radiant White – SFM-27

Experience optimal auditory notifications with our cutting-edge DC 3-24V 12V 2-Wire Intermittent Active Electronic Buzzer Alarm in a sleek Radiant White design – the SFM-27. This brand-new addition to our lineup ensures you never miss a beat.

Key Features:

  • Voltage Versatility: Operating seamlessly within a voltage range of 3-24V and specifically rated at 12V, this electronic buzzer adapts to your power needs.
  • Enhanced Audibility: Emitting a commanding 95dB sound output at a mere 10cm distance, ensuring clear audibility in various environments.
  • Precise Construction: The alarm boasts an alarm diameter of 29mm, a height of 15mm, and two mounting holes spaced at 40mm, simplifying installation.
  • Resilient Build: Crafted from high-quality ABS material, guaranteeing longevity and consistent performance even in challenging conditions within a temperature range of -20°C to +80°C.
  • Versatile Usage: Ideal for applications where intermittent sound alerts are essential, this buzzer stands ready to serve across diverse settings.
  • Uncomplicated Setup: The two-wire design, accompanied by 105mm of wire length, facilitates straightforward integration into your projects.
  • Comprehensive Package: Each package includes 1 SFM-27 Buzzer Alarm, providing you with an instant solution.

Whether for industrial purposes or personal projects, the DC 3-24V 12V 2-Wire Intermittent Active Electronic Buzzer Alarm in Radiant White – SFM-27 guarantees attention-grabbing alerts. Elevate your auditory experience today. Don’t settle for ordinary; choose the extraordinary.

📌 Code Examples & Usage – 3–24V Active Electronic Buzzer (2-Wire)

📋 Overview

This 2-wire active electronic buzzer is a self-driven sounder that produces an audible alarm when DC power is applied. Unlike passive buzzers, it does not require a PWM or tone signal — it sounds automatically when powered.

It is ideal for:

  • Alarm and warning indicators

  • PLC output alarms

  • Industrial control panels

  • Arduino & ESP32 projects

  • Status alerts and fault indication

⚙ Key Features

  • Type: Active electronic buzzer

  • Wiring: 2-wire

  • Operating voltage: 3–24V DC (12V typical)

  • Built-in oscillator (no tone generation required)

  • Produces intermittent / pulsed alarm sound

  • Compact and low power consumption

⚠ IMPORTANT – Active vs Passive (READ THIS)

🚨 This is an ACTIVE buzzer

✔ Sounds automatically when powered
✔ Only needs DC voltage
✔ Can be switched with a transistor, relay, or digital output

❌ Not suitable if you want:

  • Musical tones

  • Variable pitch

  • Frequency control

📌 For tones or melodies, use a passive buzzer instead.

🔌 Wiring Basics (2-Wire)

Wire Function
+ DC Positive (3–24V)
– DC Ground

📌 Polarity matters — reverse connection may prevent operation.

🔌 PLC Wiring Example (24V Output)

PLC DO+ ───► Buzzer +
Buzzer – ───► PLC DO–

✔ Perfect for alarms, fault outputs, and warnings.

🔌 Arduino / ESP32 Wiring (Recommended Method)

Because this buzzer can draw more current and may operate at higher voltage, do not power directly from an I/O pin.

Option A – Drive via Transistor (Best Practice)

Arduino D8 ──► 1kΩ ──► NPN Base
Emitter ───► GND
Collector ───► Buzzer –
Buzzer + ───► External DC Supply (e.g. 12V)

📌 Use a common ground between Arduino and power supply.

🧪 Arduino Example – Turn Buzzer ON / OFF

const int buzzerPin = 8;

void setup() {
pinMode(buzzerPin, OUTPUT);
digitalWrite(buzzerPin, LOW);
}

void loop() {
digitalWrite(buzzerPin, HIGH); // Buzzer ON
delay(2000);

digitalWrite(buzzerPin, LOW); // Buzzer OFF
delay(2000);
}

✔ Works because the buzzer generates its own sound.

🧪 Intermittent Alarm Example

void loop() {
for (int i = 0; i < 5; i++) {
digitalWrite(buzzerPin, HIGH);
delay(300);
digitalWrite(buzzerPin, LOW);
delay(300);
}
delay(2000);
}

📌 This creates a repeating alert pattern.

🔋 Power Notes

  • Use external DC power for 12V or higher operation

  • Arduino / ESP32 pins are control only

  • Typical current draw is low, but do not exceed pin limits

🧠 Common Issues & Fixes

Issue Cause Fix
No sound Polarity reversed Swap wires
Quiet sound Low voltage Increase supply voltage
MCU resets Direct power draw Use transistor or relay
Continuous sound Active type This is normal operation
No tone control Active buzzer Use passive buzzer if needed

Additional information

Weight 20 g
Dimensions 260 × 160 × 20 mm

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