Jopto 5PCS DC 3.3-5V Passive Low Level Trigger Buzzer Alarm Sound Module 3 Pin Control Compatible with Arduino

• There is no oscillator inside the passive, so if a DC signal is used, it cannot scream. A square wave of 2K~5K must be used to drive it.
• Passive buzzer, need input oscillation frequency in the I / O ports, and the buzzer will sound.
• The frequency of the sound is controllable, and the effect of "do re mi fa so la si" can be made.
• Operating voltage: 3.3V~5V; The module is driven by a 9012 transistor.
• Fixed bolt holes for easy installation. Uses 3 pin control port.

Features of passive buzzer: 1. There is no oscillator inside the passive, so if you use a DC signal, you can't make it sound. A square wave of 2K~5K must be used to drive it. 2. The frequency of the sound is controllable, and the effect of "do re mi fa so la si" can be made. 3. In some special cases, a control port can be reused with LED. Specification: Type: Passive The module is driven by a 9012 transistor. Working voltage: 3.3V-5V. Equipped with fixing bolt holes for easy installation. 3 Pin control. Module size: 38 × 13 × 10 mm Weight: 3.5 g Module interface description (3-wire): VCC External Connect 3.3V-5V Voltage (can be directly connected with 5v single-chip microcomputer and 3.3v single-chip microcomputer) GND External Connect GND I/O External Connect MCU IO port Package Content: 5 x Passive Buzzer Module