High Quality Passive Buzzer Module for Arduino DIY Kit

Now there are a lot of people to the concept of passive and active buzzer is not very clear. Here's a simple introduction to help everyone use them in the future. Note that in this case, the "source" is not the power supply; it is the volatile source.

The characteristics of the passive buzzer are:

• Passive internal without shock source, so if using a DC signal, it cannot make a sound. Must use 2 kHz ~ 5 kHz square wave to drive it.
• For more than 2 sound frequency control, can make "m hair sola west" effect.
• In some particular cases, can be reused with an LED control.

The characteristics of the active buzzer are:

• Active buzzer inside with shock source, so as long as there is electricity, it will call.
• Program control is convenient. A single chip microcomputer's high and low level can make the sound, which the passive buzzer cannot do.

Each module weight is about 6 g.

Module description:

• Module driven by 9012 triode.
• Working voltage of 3.3 V to 5 V.
• Sets of fixed bolt holes, convenient for installation.
• Small board PCB size: 3.3 cm X 1.3 cm.

Module interface specification (3 wire system):

• VCC external 3.3 V to 5 V voltage (which can be directly connected to 5 V microcontroller and 3.3 V microcontroller).
• GND external GND.
• I/O external microcontroller IO port.

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