The Passive Buzzer Module is a compact audio component designed for projects requiring programmable sound output. Unlike active buzzers, this passive piezo model lacks an internal oscillator, relying on an external signal—typically a square wave from a microcontroller like Arduino—to generate tones between 1.5kHz and 2.5kHz. Operating at 3.0-5.0V with a current draw of up to 25mA, it offers versatile pitch control via PWM, perfect for crafting beeps, melodies, or alerts.

Mounted on a small PCB (often around 18mm x 15mm), the module features a three-pin interface: signal (S), power (VCC), and ground (GND). Its impedance is approximately 16-50 ohms, and while it can be driven directly from an MCU pin with a series resistor (e.g., 100-220 ohms) to limit current below 20-40mA, adding a transistor boosts volume for louder applications. The piezo element, housed in durable plastic, vibrates to produce clear sound, though output remains modest without amplification—ideal for learning or small-scale uses.

Key Features:

• Customizable tones via PWM (1.5-2.5kHz)
• Operates at 3.0-5.0V with low power
• Compact piezo buzzer on PCB
• Three-pin design for easy hookup
• Flexible sound control with MCU
• Durable, lightweight construction
• Affordable audio solution

Technical Specifications:

Applications:

• Audible alerts in Arduino projects
• Sound effects for DIY electronics
• Notification tones in prototypes
• Custom alarm systems
• Educational platforms