🔧 5V Active Buzzer
Type: Active (built-in oscillator)
Operating Voltage: 5 V DC
Sound Output: Continuous beep when powered
Current Consumption: ~20–30 mA (typical)
Connection: 2 wires – VCC and GND
Applications: Alarms, reminders, timers, status indicators
Features:
Simple to use – just apply 5 V to sound
Produces a fixed frequency tone
Low power consumption
🔧 5V Passive Buzzer
Type: Passive (requires external driving signal)
Operating Voltage: 5 V DC
Sound Output: Tone frequency determined by input signal (PWM from microcontroller)
Connection: 2 wires – VCC and GND
Applications: Arduino tone generation, custom melodies, programmable alarms
Features:
Can play multiple frequencies and tunes
Works with PWM signals for sound modulation
Requires microcontroller or oscillator circuit
🧠 How They Work
Active Buzzer: Has a built-in oscillating circuit; producing sound as soon as power is applied.
Passive Buzzer: Functions as a piezo element; requires an external square wave or PWM signal to generate sound.
Both types convert electrical energy into audible vibrations.
💡 Practical Tips
Use active buzzers for simple alerts when tone and frequency do not need to change.
Use passive buzzers for custom tones, melodies, or alarms controlled by Arduino, ESP32, or Raspberry Pi.
Ensure correct voltage (5 V) to avoid damage.
Can be combined with LEDs or relays for visual/audio alert systems.