"D3806 NC DC Constant Current Power Supply Step Down Module " defective

Описание к видео "D3806 NC DC Constant Current Power Supply Step Down Module " defective

I bought from you " D3806 NC DC Constant Current Power Supply Step Down Module " running but unable to set voltage.The output voltage does not fall below the input voltage.In addition, when the input voltage is connected while the device is switched off, the output voltage is taken.

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