There are many people active and passive buzzer buzzer concept is not very clear, here to do a brief introduction, we want to be helpful for future use. Note that the "source" does not mean power. But rather refers to the shock source. Passive buzzer is characterized by: A passive internal sources without shocks, so if the DC signal can not make it with a tweet. Must 2K ~ 5K square wave to drive it 2 sound frequency controllable, you can make a "more than a meter hair Suola Xi" effect. 3 In some special cases, you can reuse a control and LED mouth Active buzzer is characterized by: An active internal buzzer with shock source, so long as a power will be called 2 program easy to control, SCM can allow a high and low sounds, while passive buzzer can not. One module description A module using 9012 transistor drive 2 Operating voltage 3.3V-5V 6 with fixed bolt hole for easy installation 7 small plates PCB size: 3.3cm * 1.3cm Two module interface specification (3-wire) 1 VCC external 3.3V-5V voltage (5v microcontroller and can be directly connected to 3.3v MCU) External GND 2 GND 3 I / O external microcontroller IO port Package Include: 6 x Active Buzzer Alarm Module Sensor Beep For Arduino Smart Car See more

If You Are Not Satisfied with Your Purchase for Any Reason, Please Feel Free To Contact Us at the Buyer Center or Support Email, 24/7 Quick Reply. Package Include: 6 x Active Buzzer Alarm Module Sensor Beep For Arduino Smart Car. 1 VCC external 3.3V-5V voltage (5v microcontroller and can be directly connected to 3.3v MCU) External GND 2 GND. small plates PCB size: 3.3cm * 1.3cm. A module using 9012 transistor drive.