Active Buzzer Alarm Sensor Beep Diy Kit Electronic PCB Board Module

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 it2 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 called2 program easy to control, SCM can allow a high and low sounds, while passive buzzer can not. One module descriptionA module using 9012 transistor drive 2 Operating voltage 3.3V-5V6 with fixed bolt hole for easy installation7 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 GND3 I / O external microcontroller IO port   Shipping list: 1PCS*An active buzzer module shown in a (test) 3PCS*20cm DuPont line