12v buzzer tweeter specification:

Detailed examples of buzzer(12v buzzer tweeter)

Under normal circumstances, the development board will be the use of active buzzer, then accompanied by a question is whether the direct buzzer directly connected to the microcontroller GPIO can ring it? In actual fact, in discussing this issue, we have to determine the maximum single-chip GPIO can provide the current is how much? Active buzzer drive current how much?

Answer: There are many kinds of SCM, here only say one of STM32F1 series STM32F103ZET6, STM32F103ZET6 this single GPIO chip can provide the maximum current of about 25mA, of course, different GPIO drive current varies, there will be The difference, this data can be found directly from the IC's datasheet. 

The buzzer drive current is 30mA or so, in contrast, the two current values are quite close, then whether it can be driven up? We consider the overall STM32F1 chip current, the maximum was 150mA, if the direct drive, then the other GPIO current will have to lower a certain value, that is, other GPIO there will be insufficient power supply instability, so here Under normal circumstances, the drive circuit will generally consider the issue. 

That is, since it can not be directly driven in the microcontroller GPIO, it can consider using a driver circuit to make the GPIO drive a small buzzer value? The answer is certain, you can. GPIO GPUs are usually used to directly drive the buzzer. Instead, the GPIO drives the buzzer through a triode, so that the GPIO of the microcontroller can drive the buzzer only with a current approaching 1mA.