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Question:

Car cd with the battery all right, with a switching power supply speaker has a buzzing sound

Car cd with the battery all right, with a switching power supply speaker has a buzzing sound

Answer:

Voltage big bar, it should be between 12 volts to 15 volts,
Need to use the power supply, switching power supply impurity
Recommended frequency transformer. Switching power supply is prone to interference, not easy to handle

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