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How to solve the problem of driving the small speaker on the power supply?

Hardware design
February 2, 2021 by Byron 64

Use the MCU output PWM to control the switch of the S8050 transistor to control the on and off of the speaker. The speaker impedance is 16 ohms, the power is 0.5W, and the current is about 150MA when it is turned on. The drive circuit is as follows, which is a bit ugly. . . The measured speaker can work, but the display screen (12V) is affected, and the screen picture will flicker. Measure the voltage. When the horn sounds, the 12V voltage will drop by about 3V. How to solve this problem? Solve. . .

驱动电路

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Adelaide Posted on February 2, 2021

Is the power capacity large enough?

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  • Byron

    Byron Posted on February 2, 2021

    Switching power supply, no problem.

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Marisol Posted on February 2, 2021

What is the input power provided by the 12V power supply? Or how big is the input current?

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  • Byron

    Byron Posted on February 2, 2021

    12V 2A is enough.

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Louise Posted on February 2, 2021

Is the microcontroller 5V or 3.3V? If it is 5V, it is recommended to connect a small resistor in series with the base of the transistor.

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