DC-DC adjustable isolated step-down power supply DC 22 -290V to DC 3.6 -15V

1. First connect the cable between the module and the power supply, and then turn on the power. (If the input terminal is connected to electricity, it is easy to catch fire, especially when the input power voltage is high, it will even burn the module pad).

2. After selecting a suitable power supply, use a multimeter or voltmeter to measure whether the module output voltage matches the voltage required by the device. The output voltage can be adjusted by turning the blue adjustable resistor on the board (3.6V to 15V) in between).

3. The electrical equipment (load) is connected to the output end of the module.

4. If the value of the adjustable potentiometer is set too large or too small, it will cause the LED indicator on the board to be off. At this time, it is only necessary to set the potentiometer value to the appropriate position.

5. If the difference between the input and output voltage is less than 15V, the LED indicator will not light.